Question

Prove this identity

(cos è - 1) / (cos^2 è) =

sec è - sec^2 è


I have a question when you simplify the secant in terms of cosine. Would you cross multiply but then again there's the subtraction sign there instead of a multiplication sign? then would you multiply by the lcd to get the demoniator to be the same for both sides, im really confused, please help me, thanks

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