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cos(2x) = 2cos²(x)-1 by the double angle formula.

Rearrange to give cos²(x) = (cos(2x)+1)/2

Integrating this gives sin(2x)/4 + 1/4x + c 

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A stationary point simply means a point in a curve where the gradient is equal to 0.For example, in the June 2015 C3 Paper it is asked:Find the exact values of the coordinates of the stationary points of ...

At first glance, this looks quite tricky, as usually when we are asked to find dy/dx, we have one equation, but here we have 2.So in this case, we need to use the statement that dy/dx = (dy/dt) * (dt/dx)T...