How to use the pyromaths.outils.Affichage.tex_coef function in pyromaths

def tex_verification(v):  # renvoie la vérification de lasolution du système d'équations.
    tv = (
        tex_coef(v[0][0], '\\times %s' % tex_coef(v[2][0],
                                '', bpn=1)),
        tex_coef(v[0][1], '\\times %s' % tex_coef(v[2][1],
                                '', bpn=1), bplus=1),
        tex_coef(v[0][0] * v[2][0], ''),
        tex_coef(v[0][1] * v[2][1], '', bplus=1),
        v[0][2],
        tex_coef(v[1][0], '\\times %s' % tex_coef(v[2][0],
                                '', bpn=1)),
        tex_coef(v[1][1], '\\times %s' % tex_coef(v[2][1],
                                '', bpn=1), bplus=1),
        tex_coef(v[1][0] * v[2][0], ''),
        tex_coef(v[1][1] * v[2][1], '', bplus=1),
        v[1][2],
        )
    return '''\\left\\lbrace
\\begin{array}{l}
%s %s=%s %s=%s \\\\\n      %s %s=%s %s=%s
\\end{array}
\\right.''' % \
        tv

def tex_equation(v, c):
    tv = (tex_coef(v[0][0], 'x'), tex_coef(v[0][1],
          'y', bplus=1), v[0][2])
    t = '$%s%s=%s\\quad\\text{et}\\quad ' % tv
    if c[0]:
        t = t + 'x=%s\\quad\\text{donc :}$\n' % v[2][0]
        tv = (tex_coef(v[0][0], ''), tex_coef(v[2][0],
              '', bpn=1), tex_coef(v[0][1], 'y', bplus=1),
              v[0][2])
        t = t + '\\[%s\\times %s %s=%s\\]\n' % tv
    else:
        t = t + 'y=%s\\quad\\text{donc :}$\n' % v[2][1]
        tv = (tex_coef(v[0][0], 'x'), tex_coef(v[0][1],
              '', bplus=1), tex_coef(v[2][1], '', bpn=1),
              v[0][2])
        t = t + '\\[%s %s\\times %s=%s\\]\n' % tv
    return t

def tex_comb2(v, c):
    if c[0]:
        tv = (tex_coef(v[0][0], 'x'), '\\cancel{' +
              tex_coef(v[0][1], 'y', bplus=1) + '}',
              tex_coef(v[1][0], 'x', bplus=1),
              '\\cancel{' + tex_coef(v[1][1], 'y', bplus=
              1) + '}', tex_coef(v[0][2], ''),
              tex_coef(v[1][2], '', bplus=1))
    else:
        tv = ('\\cancel{' + tex_coef(v[0][0], 'x') + '}',
              tex_coef(v[0][1], 'y', bplus=1),
              '\\cancel{' + tex_coef(v[1][0], 'x', bplus=
              1) + '}', tex_coef(v[1][1], 'y', bplus=1),
              tex_coef(v[0][2], ''), tex_coef(v[1][2],
              '', bplus=1))
    return '%s%s%s%s=%s%s' % tv

def tex_verification(v):  # renvoie la vérification de lasolution du système d'équations.
    tv = (
        tex_coef(v[0][0], '\\times %s' % tex_coef(v[2][0],
                                '', bpn=1)),
        tex_coef(v[0][1], '\\times %s' % tex_coef(v[2][1],
                                '', bpn=1), bplus=1),
        tex_coef(v[0][0] * v[2][0], ''),
        tex_coef(v[0][1] * v[2][1], '', bplus=1),
        v[0][2],
        tex_coef(v[1][0], '\\times %s' % tex_coef(v[2][0],
                                '', bpn=1)),
        tex_coef(v[1][1], '\\times %s' % tex_coef(v[2][1],
                                '', bpn=1), bplus=1),
        tex_coef(v[1][0] * v[2][0], ''),
        tex_coef(v[1][1] * v[2][1], '', bplus=1),
        v[1][2],
        )
    return '''\\left\\lbrace
\\begin{array}{l}
%s %s=%s %s=%s \\\\\n      %s %s=%s %s=%s
\\end{array}
\\right.''' % \
        tv

def tex_eq2(v, c):
    if c[0]:
        tv = (tex_coef(v[0][1], 'y'), tex_coef(v[0][2],
              ''), tex_coef(-v[0][0] * v[2][0], '', bplus=
              1))
        t = '%s=%s%s' % tv
    else:
        tv = (tex_coef(v[0][0], 'x'), tex_coef(v[0][2],
              ''), tex_coef(-v[0][1] * v[2][1], '', bplus=
              1))
        t = '%s=%s%s' % tv
    return t

a = (tex_coef(v[0], '\\sqrt{%s}' % v[1]), tex_coef(v[2],
         '\\sqrt{%s}' % v[3], bplus=1))
    exo.append(u'\\[ \\thenocalcul = ' + '\\left( %s%s \\right)^2' % a + '\\] ')
    cor.append(u'\\[ \\thenocalcul = ' + '\\left( %s%s \\right)^2' % a + '\\] ')
    if v[2] > 0:
        sgn = '+'
    else:
        sgn = '-'
    a = (tex_coef(v[0], '\\sqrt{%s}' % v[1], bpc=1), sgn, tex_coef(v[0],
         '\\sqrt{%s}' % v[1]), tex_coef(abs(v[2]), '\\sqrt{%s}' % v[3]),
         tex_coef(abs(v[2]), '\\sqrt{%s}' % v[3], bpc=1))
    cor.append(u'\\[ \\thenocalcul = ' + '%s^2%s2\\times%s\\times%s+%s^2' % a + '\\] ')
    a = (v[0] ** 2, v[1], tex_coef((2 * v[0]) * v[2], '\\sqrt{%s}' % (v[1] *
         v[3]), bplus=1), v[2] ** 2, v[3])
    cor.append(u'\\[ \\thenocalcul = ' + '%s\\times %s %s+%s\\times %s' % a + '\\] ')
    a = (v[0] ** 2 * v[1] + v[2] ** 2 * v[3], tex_coef((2 * v[0]) * v[2],
         '\\sqrt{%s}' % (v[1] * v[3]), bplus=1))
    cor.append(u'\\[ \\boxed{\\thenocalcul = ' + '%s%s' % a + '} \\] ')

def exo_aPbRc(exo, cor, v):
    a = (tex_coef(v[0], '\\sqrt{%s}' % v[1]), tex_coef(v[2],
         '\\sqrt{%s}' % v[3], bplus=1))
    exo.append(u'\\[ \\thenocalcul = ' + '\\left( %s%s \\right)^2' % a + '\\] ')
    cor.append(u'\\[ \\thenocalcul = ' + '\\left( %s%s \\right)^2' % a + '\\] ')
    if v[2] > 0:
        sgn = '+'
    else:
        sgn = '-'
    a = (tex_coef(v[0], '\\sqrt{%s}' % v[1], bpc=1), sgn, tex_coef(v[0],
         '\\sqrt{%s}' % v[1]), tex_coef(abs(v[2]), '\\sqrt{%s}' % v[3]),
         tex_coef(abs(v[2]), '\\sqrt{%s}' % v[3], bpc=1))
    cor.append(u'\\[ \\thenocalcul = ' + '%s^2%s2\\times%s\\times%s+%s^2' % a + '\\] ')
    a = (v[0] ** 2, v[1], tex_coef((2 * v[0]) * v[2], '\\sqrt{%s}' % (v[1] *
         v[3]), bplus=1), v[2] ** 2, v[3])
    cor.append(u'\\[ \\thenocalcul = ' + '%s\\times %s %s+%s\\times %s' % a + '\\] ')
    a = (v[0] ** 2 * v[1] + v[2] ** 2 * v[3], tex_coef((2 * v[0]) * v[2],
         '\\sqrt{%s}' % (v[1] * v[3]), bplus=1))

def tex_comb3(v):
    if v[0]:
        tv = (tex_coef(v[0], 'x'), tex_coef(v[2],
              ''))
    else:
        tv = (tex_coef(v[1], 'y'), tex_coef(v[2],
              ''))
    return '%s=%s' % tv

def exoaRb0(exo, cor, v):
    a = (tex_coef(v[0], '\\sqrt{%s}' % (v[6] * v[3] ** 2)), tex_coef(v[1],
         '\\sqrt{%s}' % (v[6] * v[4] ** 2), bplus=1), tex_coef(v[2],
         '\\sqrt{%s}' % (v[6] * v[5] ** 2), bplus=1))
    exo.append(u'\\[ \\thenocalcul = ' + '%s%s%s' % a + '\\] ')
    cor.append(u'\\[ \\thenocalcul = ' + '%s%s%s' % a + '\\] ')
    a = (tex_coef(v[0], '\\sqrt{%s}' % v[3] ** 2), v[6], tex_coef(v[1],
         '\\sqrt{%s}' % v[4] ** 2, bplus=1), v[6], tex_coef(v[2],
         '\\sqrt{%s}' % v[5] ** 2, bplus=1), v[6])
    cor.append(u'\\[ \\thenocalcul = ' +
                     '%s\\times\\sqrt{%s}%s\\times\\sqrt{%s}%s\\times\\sqrt{%s}' %
                     a + '\\] ')
    a = (
        tex_coef(v[0], ''),
        v[3],
        v[6],
        tex_coef(v[1], '', bplus=1),
        v[4],
        v[6],
        tex_coef(v[2], '', bplus=1),
        v[5],
        v[6],
        )
    cor.append(u'\\[ \\thenocalcul = ' +
                     '%s\\times%s\\times\\sqrt{%s}%s\\times%s\\times\\sqrt{%s}%s\\times%s\\times\\sqrt{%s}' %
                     a + '\\] ')
    a = (tex_coef(v[0] * v[3], '\\sqrt{%s}' % v[6]), tex_coef(v[1] * v[4],
         '\\sqrt{%s}' % v[6], bplus=1), tex_coef(v[2] * v[5],
         '\\sqrt{%s}' % v[6], bplus=1))
    cor.append(u'\\[ \\thenocalcul = ' + '%s%s%s' % a + '\\] ')