Question: Question 1 5 Find f ' ( - 3 . 9 ) when f ( x ) = - 3 x s i n x

Question 15
Find f'(-3.9) when f(x)=-3xsinx-5tanx.
-9.911(with margin: 1.5)
Question 1 5 Find f ' ( - 3 . 9 ) when f ( x ) =

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