RRB NTPC CBT I 29 Dec 2020 Shift 1 Paper

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Question : 2 of 100

Marks: +1, -0

Evaluate:
cos 20° cos 40° cos 80°

$\;{1}/{2}$
$\;{1}/{4}$
$\;{1}/{8}$
$\;{1}/{32}$

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