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Let f(theta) = 1/2 + 2/3 cosec^(2)theta ...

Let `f(theta) = 1/2 + 2/3 cosec^(2)theta + 3/8 sec^(2) theta`. The least value of `f(theta)` for all permisible values of `theta`, is

A

`31/12`

B

`61/48`

C

`61/25`

D

`61/24`

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The correct Answer is:
A
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