The value of cos210∘–cos10∘cos50∘+cos250∘ is
Held on 9 Apr 2019 · Verified 6 Jul 2026.
43
43+cos20∘
23
23(1+cos20∘)
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If $\cot x=\frac{5}{12}$ for some $x \in\left(\pi, \frac{3 \pi}{2}\right)$, then $\sin 7 x\left(\cos \frac{13 x}{2}+\sin \frac{13 x}{2}\right)+\cos 7 x\left(\cos \frac{13 x}{2}-\sin \frac{13 x}{2}\right)$ is equal to
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