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If a,b,c are positive constants such that `agtb` then the maximum value of `r^2` , given by `c^4/r^2=a^2/(sin^2theta)+b^2/(cos^2theta)` , must be

A

`c^(2)/|a-b|`

B

`c^(2)/|a+b|`

C

`c^(2)/sin^(2)theta`

D

`c^(2)/sqrtab`

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The correct Answer is:
B
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