Question

help me please to prove it

Answer 1

LHS:

$\frac{1 - tan^2A}{cot^2A - 1}$

$\frac{1 - \frac{sin^2A}{cos^2A} }{ \frac{cos^2A}{sin^2A}-1 }$

$\frac{ \frac{cos^2A-sin^2A}{cos^2A} }{ \frac{cos^2A-sin^2A}{sin^2A} }$

$\frac{cos^2A-sin^2A}{cos^2A} * \frac{sin^2A}{cos^2A-sin^2A}$

$\frac{sin^2A}{cos^2A}$

Tan^2A.


LHS = RHS.


Hope this helps!

Answer 2

Hi,

Please see the attached file!


Thanks