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OpenStudy (poofypenguin):
Help Please. Attachments to follow...
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OpenStudy (poofypenguin):
Here's the question I'm trying to solve...
OpenStudy (poofypenguin):
And here's what I got so far...
OpenStudy (poofypenguin):
I got the derivative function incorrect but somehow I miraculously got the f'(-pi/4) correct...can anyone please explain what happened?
OpenStudy (shubhamsrg):
you have calculated f'(x) wrongly.. d/dx (xsinx) = sin x + xcos x.. do you get it ? same for xcosx
OpenStudy (poofypenguin):
I'm not sure i understand how you got those...i'm not very confident with derivatives of trig identities...
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OpenStudy (shubhamsrg):
you'll have to apply product rule here.. 2 functions of x are involved there,,1 is x,,other is sin x
OpenStudy (poofypenguin):
Alright! Thanks for your help! :D
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