Medium
Find the derivative of the function: $f(x) = 5 \sin x - 6 \cos x + 7$.
- A$5 \cos x + 6 \sin x$
- B$5 \cos x - 6 \sin x$
- C$-5 \cos x + 6 \sin x$
- D$-5 \cos x - 6 \sin x$
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