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যদি

\sin 18 ° = \frac{1}{4} (\sqrt{5} - 1)

\cos 36 °

\frac{1}{4} (\sqrt{5} - 1)

\frac{1}{4} (\sqrt{5} + 1)

\frac{1}{5} (\sqrt{4} - 1)

\frac{1}{5} (\sqrt{4} + 1)

ANS : 2

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