If $\frac{2+3 i \sin heta}{1-2 i \sin heta}$ is purely imaginary, then $\cos ^2 heta=$

Question

If $\frac{2+3 i \sin 	heta}{1-2 i \sin 	heta}$ is purely imaginary, then $\cos ^2 	heta=$

Aicharya · Accepted Answer

No solution. Refer to answer key.

If $\frac{2+3 i \sin \theta}{1-2 i \sin \theta}$ is purely imaginary, then $\cos ^2 \theta=$