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Answer 1

Answer:

b. cosx + 6 sinx

Step-by-step explanation:

$\frac{d}{dx} ( sinx - 6 cos \: x) \\ \\ = \frac{d}{dx} sinx - 6\frac{d}{dx} cos \: x \\ \\ = cos \: x - 6( - sin \: x) \\ \\ = cos \: x + 6 \: sin \: x$

Answer 2

The answer is B cosx + 6 sinx