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  4. If sin 18° =(√5-1/4), then sin 81° is equal to

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Q. If sin 18$^\circ$ =$\frac{\sqrt{5}-1}{4},$ then sin 81$^\circ$ is equal to

Solution:

Correct answer is (b) $\frac{\sqrt{3+\sqrt{5}}+\sqrt{5-\sqrt{5}}}{4}$