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Prove identity.. Precalc help?

0 votes

Prove the identity: 
(Sinx + cosx)^2 - 1 / cosx = (sin2x)(tanx)(cscx) 

asked Apr 23, 2014 in PRECALCULUS by anonymous

1 Answer

0 votes

Consider the equation as image.

L.H.S = image

image                                    

image                                                 image

image

image

Multiply  numerator and denominator by image.

image

image

image

= R.H.S.

answered Apr 26, 2014 by lilly Expert

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