Hàm số \(y = \tan x - \cot x + \cos \dfrac{x}{5}\) có đạo hàm bằng:
A.\(\dfrac{1}{{\cos x}} - \dfrac{1}{{\sin x}} + \dfrac{1}{5}\sin \dfrac{x}{5}\)
B.\(\dfrac{1}{{{{\cos }^2}x}} + \dfrac{1}{{{{\sin }^2}x}} - \dfrac{1}{5}\sin \dfrac{x}{5}\)
C.\(\dfrac{1}{{{{\cos }^2}x}} - \dfrac{1}{{{{\sin }^2}x}} - \dfrac{1}{5}\sin \dfrac{x}{5}\)
D.\(\dfrac{1}{{\cos x}} + \dfrac{1}{{\sin x}} + \dfrac{1}{5}\sin \dfrac{x}{5}\)
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Hóa Học lớp 12
