Proof number one: prove that Proof number two: prove that Any help is appreciated!
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In Q1, try replacing cos 2x with cos^2 x - sin^2 x , factorise DOTS and cancel. Then start with RHS and replace sin 2x with 2 sinx cos x and think about what you could replace the 1 with. In Q2, get both sides in terms of sin x and cos x only
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