What is the value of \(\frac{d}{dx}(\frac{cos⁡x}{sec⁡x \,tan⁡x})

1.	What is the value of \(\frac{d}{dx}(\frac{cos⁡x}{sec⁡x \,tan⁡x})\)?
A.	-tan2⁡ x(3 sin2⁡ x – cos2 x)
B.	-cot2 x(3 sin2⁡ x – cos2 x)
C.	-cot2 x(3 sin2⁡ x + cos2 x)
D.	-tan2⁡ x(3 sin2⁡ x + cos2 x)
Answer» D.

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