1.

Solve `4 cos^(2)x+6 sin^(2)x=5`.

Answer» Correct Answer - `x=n pi pm pi/4, n in Z`
`4+2 sin^(2) x=5`
or `sin^(2) x=1/2= sin^(2) pi/4`
`rArr x=n pi pm pi/4, n in Z`


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