Class 11MathematicsTrigonometric FunctionsFundamental trigonometrical ratios and functions, Trigonometrical ratio of allied angles
DifficultThe value of $\cos 255^o + \sin 195^o$ is
- A$\frac{\sqrt{3} - 1}{2\sqrt{2}}$
- B$\frac{\sqrt{3} - 1}{\sqrt{2}}$
- C$-\frac{\sqrt{3} - 1}{\sqrt{2}}$
- D$\frac{\sqrt{3} + 1}{\sqrt{2}}$
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