Question

(Cos theta - cos theta)^2+(cos theta + cos theta)^2

A. Sin^2 theta
B. 4cos^2 theta
C. 8
D. Cos^2 theta

Answer 1

B

Answer 2

because
(Cos theta - cos theta)^2+(cos theta + cos theta)^2\[(Cos \theta - \cos \theta)^2 =0\]

Answer 3

\[+(\cos \theta + \cos \theta)^2=(2\cos \theta)^2 =4\cos^2 \theta\]