Given tan(A) = 2 and A is in Quadrant I, find cos(2A).

Question

A. 0
B. 1
C. 1/2
D. -3/5

Answer 1

Just noticed that you posted this new question after Steve showed you how to do it.
In the one Steve answered for you, it had asked for sin(2A)
This time they are asking for cos(2A), surely you can make that minor adjustment.
Did you even look at his solution?