SSC CHSL 17 Mar 2020 Shift 2 Paper

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Question : 63 of 100

Marks: +1, -0

Find the value of

\cos 225°

$-0.7071$
$-0.866$
$0.7071$
$0.866$

Solution:

\cos 225°

⇒

\cos (180°+45°)

[lies in Ill quadrant]
⇒

-\cos 45°

(\∵\cos 45°={1}/{\√{2}})

⇒

-{1}/{\√{2}}=-0.7071

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