Question

cosx-sinx=1 general solution

Answer 1

sin^2x+cos^2x=1
or(sinx-cosx)^2+2sinxcosx=1
or, 1+2sinxcosx=1
or,2sinxcosx=0
or,sinxcosx=0
or,sinx=sin0°
or,x=0°

OR,cosx=0
or,cosx=cos90°
or,x=90°

Answer 2

above answer is absolutely correct