How do you find antidervatives of a funtion? Help please?

January 10th, 2012

Question by Toby S: How do you find antidervatives of a funtion? Help please?
Okay so I need to find the integral of 2(x)cos(x). The answer is like 2 something something,,

Best answer:

Answer by Ed I
? 2x cos x dx

Let’s use Integration by Parts.

Let u = 2x and dv = cos x dx
then du = 2 dx and v = sin x

2x sin x – 2 ? sin x dx = 2x sin x + 2 cos x + C

Give your answer to this question below!

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