Pleaee solve this problem!!

 see proof below

Step-by-step explanation:

Use the following Double Angle Identities:

sin 2A = 2cos A · sin A

cos 2A = 2 cos²A - 1

Use the following Quotient Identity: tan A = (sin A)/(cos A)

Use the following Pythagorean Identity:

cos²A + sin²A = 1   -->   sin²A = 1 - cos²A

Proof LHS → RHS

Given:                            

Let Ф = 2A:                    

Un-factor:                      

Pythagorean Identity:  

Simplify:                          

Double Angle Identity:  

Simplify:                          

Quotient Identity:       tan A

i dont know their was no answer choice jiggaboo

(im black)

step-by-step explanation: