(1+tanx)/(sinx+cosx)=secx

sinx+cosx=(2sin^2x-1)/(sinx-cosx)

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- September 18th 2008, 04:15 PMKingreapertrig identity verifying
(1+tanx)/(sinx+cosx)=secx

sinx+cosx=(2sin^2x-1)/(sinx-cosx) - September 18th 2008, 04:18 PMhwhelper
For 1. use tan x = sin x / cos x and sec x = 1 / cos x

For 2. use sin^2 x + cos^2 x = 1 in RHS