prove this (1+cosx)/(1-cosx)=(1+secx)/(secx-1)

prove: 1+cosx/1-cosx-1-cosx/1+cosx=4cotxcscx

If y = e^x cosx, prove that dy/dx sqrt(2) e^x . cos(x+ pie/4)

prove(sinx/cosx+1)+(cosx-1/sinx)=0

prove(sinx/cosx+1)+(cosx-1/sinx)=0 Please help asap!!!!! PLEASE

prove that tan^2 (x/2)=1-cosx/1+cosx

Prove 1-cosx+sinx / 1+cosx+sinx =tan x/2

prove that the value of cosx + secx can never be 3/2.

Prove that 1+cosx+sinx/1-cosx+sinx=cotx

Prove that 1-cosx/1+cosx=tan^2x/2

Prove that 1-sin^2x/cosx = sin 2x/2sinx

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