Let `f(theta) = 1/2 + 2/3 cosec^(2)theta + 3/8 sec^(2) theta`. The least value of `f(theta)`

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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
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