2(sinx)^2-sinxcosx-(cosx)^2=1 X solution set is required

(sinx)^2-sinxcosx-2(cosx)^2=0
(sinx-2cosx)(sinx+cosx)=0
sinx=2cosx
tanx=2
X = atan (2) + k * PI, K is an integer
Or SiNx = - cosx
tanx=-1
X = 0.75pi + k * PI, K is an integer

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