∫cos²x dx is equal to:
∫cos²x dx is equal to:
- A. x/2 + (sin 2x)/4 + C
- B. x/2 − (sin 2x)/4 + C
- C. sin²x + C
- D. x + sin 2x + C
Answer: A) x/2 + (sin 2x)/4 + C
Explanation: cos²x = (1 + cos 2x)/2. Integral = ∫(1/2)dx + (1/2)∫cos 2x dx = x/2 + (sin 2x)/4 + C.
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