1.

Let M and m respectively denote the maximum and the minimum values of [f(theta)^2],where f(theta)=sqrt(a^2+cos^2theta+b^2sin^2theta)+sqrt(a^2 sin^2 theta+b^2 cos^2 theta). Then M-m=

Answer»

`a^2+B^2`
`(a-b)^2`
`a^2 b^2`
`(a+b)^2`

ANSWER :B


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