Mathematics - Trigonometric Ratios & Identities Question with Solution | TestHub

number of solutions in $[0,2\pi ]$ is 3

has a solution in $\left(\frac{n\pi }{2},(n+1)\frac{\pi }{2}\right),\forall n\in I$

has a solution in $\left(\frac{n\pi }{2},(n+1)\frac{\pi }{2}\right),\forall n\in 2N$ ( N is set of natural numbers)

has a solution in $\left((2n+1)\frac{\pi }{2},(n+1)\pi \right),\forall n\in I^{-}$( $I^{-}$is set of negative integers)