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If x+a= a(2 cos theta-cos 2 theta) and y...

If `x+a= a(2 cos theta-cos 2 theta) and y= a(2 sin theta- sin 2 theta)`,show that `(x^(2)+y^(2)+2ax)^(2)=4a^(2)(x^(2)+y^(2))`.

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