Hi guys, What is another way of representing x sin (x). I forgot the identity? Code: Let f(x) = x sin (x) find f''(2) Real simple I know but I just forgot the other way of representing x sin (x) Thanks!
Let f(x) = x sin (x) find f''(2)
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Originally Posted by mant1s Hi guys, What is another way of representing x sin (x). I forgot the identity? Code: Let f(x) = x sin (x) find f''(2) Real simple I know but I just forgot the other way of representing x sin (x) Thanks! Why don't you just differentiate twice? f'(x) = sin x + x cos x f"(x) = cos x + cos x - x sin x = 2 cos x - x sinx f"(2) = 2 cos 2 - 2 sin 2 I might be missing something about 'representations' here but it looks pretty straight-forward twice differentiation task.
Originally Posted by apcalculus f'(x) = sin x + x cos x Thanks for your help, that's what I was getting confused on. cheers, -M
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