trigonometry

Question: For $A=133{}^\circ ,\ 2\cos \frac{A}{2}$is equal to

1) $-\sqrt{1+\sin A}-\sqrt{1-\sin A}$

2) $-\sqrt{1+\sin A}+\sqrt{1-\sin A}$

3) $\sqrt{1+\sin A}-\sqrt{1-\sin A}$

4) $\sqrt{1+\sin A}+\sqrt{1-\sin A}$

Solution:

Explanation: No Solution

Trigonometric ratios of multiple and sub-multiple angles

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