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using the product rule

product rule is dy/dx=v.du/dx+u.dv/dx

let u = x^2 and v = cos(x)

du/dx=2x

dv/dx = -sin(x)

so dy/dx=2xcos(x)-x^2sin(x)

(1/2)x(5/8)=5/16

100/16=6.25

6.25 x 5 = 31.25

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