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Yes, the derivative of f is -16cos(x)(-sinx)- 16cosx

At least thats what I think

need help

I'm having a problem doing this ... my brain is fried

um, i think the derivative is maybe : 16cos(x)(-sin(x)-16cos(x)
...

We can factor -16cosx, so -16cos(x)(sinx +1)

That means f'x = 0 when sinx=-1 or cos(x)=0, right?

not getting x

mean value theorem?

I think I've got it

72500-60900=11600*7=81200
u guys r awesome

catch guys nex time
Thnks again

And if you plug in, say 5pi/4?
it's increasing on the second interval and decreasing on the third

What about the inflection points?

I guess it's where f'(x) changes sign?

Or do i need to get f''(x)