Question

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Answer 1

cos(y)*y'

Answer 2

that is the heart of the chain rule

Answer 3

chain rule

Answer 4

perl go to math chat plz

Answer 5

Notice this is a derivative with respect to x:
\(\dfrac{d}{dx} \cos u = (\sin u) \dfrac{du}{dx}\)

Answer 6

The derivative of y with respect to x is y', so \(\dfrac{d}{dx} (2y) = 2 \dfrac{dy}{dx} \)

Answer 7

No, you're not. You ask questions to learn. That is smart, not stupid.