Question

show that 1-tan²theta/1+tan² theta = 2cos²theta​

Answer 1

Answer:

$\frac{1 - { \tan( \alpha ) }^{2} }{1 + { \tan( \alpha ) }^{2} } = 2 { \cos( \alpha ) }^{2} - 1$

to prove that

Answer 2

Answer:

just ho through this

Step-by-step explanation:

easy and simple.just reverse it.