What is the average of sixty terms given below?
$$\cos^{2}x$$, $$\cos^{2}2x \cos^{2}3x$$,... $$\cos^{2}30x$$, $$\sin^{2}x$$, $$\sin^{2}2x$$, $$\sin^{2}3x$$,... $$ \sin^{2}30x$$

A

$$\cos^{2}x$$

B

0.5

C

1

D

$$\cos^{2}x\sin^{2}x$$