lalokio
double derivative of y = 5cosx be y'' = 5cosx or cosx? I believe it's + cosx but I wanna make sure.



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myininaya
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And what did you get for y'?

lalokio
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y' = 5sinx . I'm assuming the  cancels out since it's already .

myininaya
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y' is correct
So what is derivative of sin(x)?
And don't forget to bring our constant multiple down.

myininaya
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And yes a negative times a negative is a positive.

lalokio
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cosx

lalokio
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cosx

myininaya
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Right so y''=5cos(x)