If \(f(x + h) = \cos (x + h)\) then \({f^'}(x)\) equals _____:

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3 + 0 =
Solve this simple math problem and enter the result. E.g. for 1+3, enter 4.

If \(f(x + h) = \cos (x + h)\) then \({f^'}(x)\) equals _____:

-cos x

cos x

-sin x

sin x