1.

If a ne b, x ne n pi n in Z and y^(2) = a^(2) cos^(2) x +b^(2) sin^(2)x, " then " (d^(2)y)/(dx^(2))+y =

Answer»

`((ab)/(y))^(2)`
`(1)/(y)((ab)/(y))^(2)`
`((ab)^(2))/(y)`
`(ab)/(y^(3))`

Answer :B


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