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5. Prove the following identities: sin (x - y) a cos x+ + sin x - = 0 b) tan x - tan y =

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5. Prove the following identities: sin (x - y) a cos x+ + sin x - = 0 b) tan x - tan y = 3 cos x cos y 1 + sin 2x c cos* x - sin* x = cos 2x d) = 1+ -sec x csc x sin 2x 2

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