Question: Evaluate the derivative using properties of logarithms where needed. d/dx (9^cosx) a.-sin x 9^cosx b. -sinx 9^cos x-1 c. -ln 9 sin x 9^cosx d.

Evaluate the derivative using properties of logarithms where needed.

d/dx (9^cosx)

a.-sin x 9^cosx

b. -sinx 9^cos x-1

c. -ln 9 sin x 9^cosx

d. -ln 9 sin x 9^cosx-1

(please include a few key steps)

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