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# Mathematics Mathematics & Economics Essay Research (Essay Sample)

Instructions:

the assignment was about solving mathematical problems

source..Content:

MATHEMATICS

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1 xsin3x

let u=x du=dx

dv=sin3x v=-cos3x

uv-vdu replacing the value -x+cos3x-sin3x+c

2

cosα-sinαsinα-cosα

det=-cos∝2+sin∝2

inverse A-1=-cos∝sin∝-sin∝cos∝

-cos∝cos∝2+sin∝2sin∝cos∝2+sin∝2-sin∝cos∝2+sin∝2cos∝cos∝2+sin∝2

3

y=mx+1 and y=4x Find m

equate the equation mx+1=4x

square both sides mx2+1=4x

collect like terms mx2-4x=-1

mx=-1+4x

m=-1x+ 2

4 x2-y2+2xy dxdy

fx,y=x2-y2+2xy dxdy

fx=2x-y2+2y y is constant

fy=x2-2y+2x x is constant

5

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