Question

pls solve this integration problem​

Answer 1

Answer:

∫ cos² x dx = ∫ (1 + cos 2x) / 2 dx

= 1/2 ∫ (1 + cos 2x) dx

= 1/2 (x + 1/2 sin 2x) + C

= 1/2 x + 1/4 sin 2x + C