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What is the value of the second derivative of function y=10cos5x for x=3? I got the...

What is the value of the second derivative of function y=10cos5x for x=3?

I got the second derivative as -250cos(5x) , but didn't get the correct answer when plugging in 3. help.

What is the value of the second derivative of function y=x^4+x^3-5x^2-20x-100?

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