trigonometry

Question: The value of $\cos 15{}^\circ -\sin 15{}^\circ $is equal to

1) $\frac{1}{\sqrt{2}}$

2) $\frac{1}{2}$

3) $-\frac{1}{\sqrt{2}}$

4) 0

Solution:

Explanation: No Solution

Trigonometric ratios of sum and difference of two and three

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