Question

I can't figure this one out.

Answer 1

Answer:

Option D. tan 225° is the correct answer.

Step-by-step explanation:

As we know $tan2A = \frac{2tanA}{1-tanx^{2}A }$

Given in the question angle A = 112.5°

Hence the formula becomes as

$tan2(112.5)=\frac{2tan( 112.5)}{1-tan^{2}(112.5) }$

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

Option D. is the correct answer.