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The least positive value of theta that s...

The least positive value of `theta` that satisfies `1/(cos5theta)=1/(costheta)+1/(cos 3 theta)` is `(a pi)/b` where `a` and `b` are natural numbers and H.C.F of a and b is 1 then

A

`a+b` is multiple of 5

B

b is a prime

C

b is a product of 2 primes

D

b is an even number

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