Categories > trigonometry > Trigonometric ratios of multiple and sub-multiple angles > If $\alpha $ is a root of $25{{\cos }^{2}}\theta +5\cos \theta -12=0$, $\pi /2<\alpha <\pi $, then $\sin 2\alpha $is equal to

trigonometry

Question: If $\alpha $ is a root of $25{{\cos }^{2}}\theta +5\cos \theta -12=0$, $\pi /2<\alpha <\pi $, then $\sin 2\alpha $is equal to


1) $24/25$
2) $-24/25$
3) $13/18$
4) $-13/18$
Solution: Explanation: No Solution
Trigonometric ratios of multiple and sub-multiple angles

Rate this question:

★ ★ ★ ★ ★

Average rating: (0 votes)

Previous Question Next Question

Related Questions