Tìm nguyên hàm của hàm số \(f(x) = \frac{{{{\sin }^3}x}}{{{{\cos }^4}x}}\).
A. \(\int {f(x)dx} = \frac{1}{{3{{\cos }^3}x}} - \frac{1}{{\cos x}} + C\)
B. \(\int {f(x)dx} = \frac{1}{{3{{\cos }^3}x}} + \frac{1}{{\cos x}} + C\)
C. \(\int {f(x)dx} = \frac{1}{{\cos x}} - \frac{1}{{3{{\cos }^3}x}} + C\)
D. \(\int {f(x)dx} = - \frac{1}{{\cos x}} - \frac{1}{{3{{\cos }^3}x}} + C\)
A. \(\int {f(x)dx} = \frac{1}{{3{{\cos }^3}x}} - \frac{1}{{\cos x}} + C\)
B. \(\int {f(x)dx} = \frac{1}{{3{{\cos }^3}x}} + \frac{1}{{\cos x}} + C\)
C. \(\int {f(x)dx} = \frac{1}{{\cos x}} - \frac{1}{{3{{\cos }^3}x}} + C\)
D. \(\int {f(x)dx} = - \frac{1}{{\cos x}} - \frac{1}{{3{{\cos }^3}x}} + C\)