Is the equation sinx + cosx = 1 an identity? Why?

y=1\3logtan(cosx+sinx\cosx-sinx)

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

secx/sinx-sinx/cosx=cotx

sinx/1-cosx+1-cosx/sinx=2cscx

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

integrate:cosx+2/cosx+sinx

If the equation sinx+cosx=m processes solution then range of the range of values of m is given by?

cosx+sinx/cosx-sinx = sec2x+tan2x

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