If sin theta plus 2cos theta =1 p.t. 2sintheta mimus cos theta =2
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(2 sin theta-cos theta )^2+(sin theta+2cos theta)^2=x^2+1
5sin^2 theta + 5cos^2 theta =x^2+1
x^2+1=5
x^2=4
x=2 (proved )
5sin^2 theta + 5cos^2 theta =x^2+1
x^2+1=5
x^2=4
x=2 (proved )
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