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Integrate the function (3-5x)*cos4x.
Solution
One of the techniques for evaluating integrals is integration by parts.
We'll express the formula of integration by parts using differentials:
Int u dv = u*v - Int v du
We'll put u = 3 - 5x
We'll differentiate both sides:
du = -5dx
We'll put dv = cos(4x) dx.
We'll integrate both sides:
Int dv = Int cos(4x) dx
v = (sin 4x)/4
We'll substitute in the formula of integral:
Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 + 5 Int (sin 4x)dx/4
Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 + (5/4)Int (sin 4x)dx
Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 + (5/4)[(1/4)(- cos 4x)] + C
Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 - (5/16)[(cos 4x)] + C

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Integrate the function (3-5x)cos4x.SolutionOne of the techniq.pdf

  • 1. Integrate the function (3-5x)*cos4x. Solution One of the techniques for evaluating integrals is integration by parts. We'll express the formula of integration by parts using differentials: Int u dv = u*v - Int v du We'll put u = 3 - 5x We'll differentiate both sides: du = -5dx We'll put dv = cos(4x) dx. We'll integrate both sides: Int dv = Int cos(4x) dx v = (sin 4x)/4 We'll substitute in the formula of integral: Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 + 5 Int (sin 4x)dx/4 Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 + (5/4)Int (sin 4x)dx Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 + (5/4)[(1/4)(- cos 4x)] + C Int (3 - 5x) cos(4x) dx = (3 - 5x)*(sin 4x)/4 - (5/16)[(cos 4x)] + C