Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesFundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles
Easy$\sin 690^{\circ} \times \sec 240^{\circ} = $
- A$1$
- B$-1$
- C$\frac{-1}{2}$
- D$\frac{1}{2}$
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