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JEE Advance - Mathematics (1988 - No. 21)

The value of the expression $$\sqrt 3 \,\cos \,ec\,{20^0} - \sec \,{20^0}$$ is equal to
2
$$2\sin {20^0}/\sin {40^0}$$
4
$$4\sin {20^0}/\sin {40^0}$$

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