JEE MATHEMATICS MCQ: TRIGONOMETRY RATIOS

1 Easy

1 of 1

Application +4 | -1

The value of

\cos 20^{\circ}+\cos 80^{\circ}-\sqrt{3} \cos 50^{\circ}

is equal to -

View answer and explanation

Correct option: A

Option A (0) is correct because by using the sum-to-product trigonometric identity and simplifying, the expression evaluates to 0.

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\tan \alpha=\frac{p}{q}

\alpha=6 \beta

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\frac{1}{2}[p \operatorname{cosec} 2 \beta-q \sec 2 \beta]

\cos 12^{\circ}+\cos 84^{\circ}+\cos 156^{\circ}+\cos 132^{\circ}

\triangle A B C

C

{\sin ^6}\,\,\theta + {\cos ^6}\,\,\theta + 3{\sin ^2}\,\,\theta \,\,{\cos ^2}\,\,\theta

\sin ^2 \frac{A}{2}+\sin ^2 \frac{B}{2}+\sin ^2 \frac{C}{2}=

\sin ^2(A / 2)+\sin ^2(B / 2)-\sin ^2(C / 2)=