6. (a) Express cos (2 tan- ) (b) Express sin (2 cosx) as an algebraic expression in x. (c) Express sin (tan-x – (d) Express cos (sin-x – cos and sin tan as an algebraic expression in x. -1 1 tan-y) as an algebraic expression in x and y) as an algebraic expression in x and y. y. -1

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