exam Maths Puzzle Numerical Ability

Please help me solve x^2=2x^2
Thank you very much
I am in a Gateways high school math course no textbook

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exam Other Question

Subtract and Simplify

((2-y)/(y-4))-((9y-4)/(4-y))

Thank you I really need help with this!!! Let cos beta =a .Find the expression for cos 2beta and sin 2beta in terms of a
and hence confirm that - cos(square)2beta + sin(square)2beta = 1