Question

I can't figure this one out.

Answer 1

Option D. tan 225° is the correct answer.

Explanation:

As we know
`tan2A = (2tanA)/(1-tanx^(2)A )`

Given in the question angle A = 112.5°

Hence the formula becomes as

`tan2(112.5)=(2tan( 112.5))/(1-tan^(2)(112.5) )`

Therefore its a formula of tan2(112.5) = tan 225°

Option D. is the correct answer.