Posted by **sh** on Thursday, May 28, 2009 at 4:46am.

Proving identity

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

RS: (sinx+(sinx/cosx))/(cosx+1)

((sinxcosx/cosx)+(sinx/cosx))x 1/(cosx+1)

sinx(cosx+1)/cosx x 1/(cosx+1)

sinx/cosx = tanx

RS = LS

How did sinxcosx/cosx turn to sinx(cosx+1)?

- Math -
**sh**, Thursday, May 28, 2009 at 4:49am
solved

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