veronikarossi veronikarossi

06-02-2017
Mathematics

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Prove the identity:

cos(x-y)/cos x sin y = cot y + tan x

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LammettHash LammettHash

06-02-2017

[tex]\dfrac{\cos(x-y)}{\cos x\sin y}=\dfrac{\cos x\cos y+\sin x\sin y}{\cos x\sin y}=\dfrac{\cos y}{\sin y}+\dfrac{\sin x}{\cos x}=\cot y+\tan x[/tex]

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