Answer
$f'(g(x)) = 2cosx$
Work Step by Step
$f(u) = 2u + 1, g(x) = 2x+1$
$f(g(x)) = 2(sinx) + 1$
$f'(g(x)) = 2cosx + 0$
$f'(g(x)) = 2cosx$
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