the number of solution for : 2sin^2x + sin^2 2x =2 and x belongs from 0 to 2π
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2sin^2 X +4sin^2x cos ^2x=2
2sin^x(1+2cos ^2 X) =2
sin^2 x(1+2(1-sin^2x))=1
Now let sin square x=t ....and solve it as quad
2sin^x(1+2cos ^2 X) =2
sin^2 x(1+2(1-sin^2x))=1
Now let sin square x=t ....and solve it as quad
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