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(x+4)((x^2) - kx - 5) is expanded and simplified. The coefficient of the x^2 term twice the coefficient of the x term. Work out the value of k.

Differentiate y = x*cos(2x)

Use the factor theorem to show that (x-1) is a factor of x^3 - 3x^2 -13x + 15

To differentiate a simple equation: y= 4x^3 + 7x

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