Tìm nguyên hàm của hàm số \(f(x) = {\sin ^2}x\).
A. \(\int {f(x)dx = } \frac{1}{2}x + \frac{1}{4}\sin 2x + C\)
B. \(\int {f(x)dx = } - \frac{1}{2}x + \frac{1}{4}\sin 2x + C\)
C. \(\int {f(x)dx = } - \frac{1}{2}x - \frac{1}{4}\sin 2x + C\)
D. \(\int {f(x)dx = } \frac{1}{2}x - \frac{1}{4}\sin 2x + C\)
A. \(\int {f(x)dx = } \frac{1}{2}x + \frac{1}{4}\sin 2x + C\)
B. \(\int {f(x)dx = } - \frac{1}{2}x + \frac{1}{4}\sin 2x + C\)
C. \(\int {f(x)dx = } - \frac{1}{2}x - \frac{1}{4}\sin 2x + C\)
D. \(\int {f(x)dx = } \frac{1}{2}x - \frac{1}{4}\sin 2x + C\)