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Question

Prove that tan x + cot x = sec x . Cose x.

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Solution

Dear student,


tan x +cot x =sin xcosx+cos xsin x=sin2x+cos2xcos x . sin x {sin2x+cos2x=1}=1cos x. sin x {1cos x=sec x & 1sin x= cosec x}=sec x . cosec x

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