1.

Sum of the root of the equation 2sin^(2)theta+sin^(2)2 theta=2, 0lethetalepi//2 is

Answer»

`pi//2`
`3pi//4`
`7pi//2`
`5pi//12`

Solution :`4sin^(2)thetacos^(2)theta=2(1-sin^(2)theta)`
`IMPLIES(2SIN^(2)theta-1)cos^(2)theta=0`
`impliessin^(2)theta=1//2)` or `cos^(2)theta=0`
`impliestheta-pi//4` or `theta=pi//2`


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