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Question

Mathematics Question on Trigonometric Functions

The value of cos 20∘^\circ cos 40∘^\circ cos 60∘^\circ cos 80∘^\circ is equal to

A

38\frac {3} {8}

B

116\frac {1} {16}

C

18\frac {1} {8}

D

316\frac {3} {16}

Answer

38\frac {3} {8}

Explanation

Solution

Answer (a) 38\frac {3} {8}