SSC CGL 3 Sep 2016 Paper

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Question : 62 of 100

Marks: +1, -0

The value of

cos^2

20° +

cos^2

70° is :

0
1
$1/2$
$1/√3$

Solution:

cos^2

20° +

cos^2

70°
=

cos^2

20° +

cos^2

(90° – 20°)
=

cos^2

20° +

sin^2

20° = 1
[Since cos (90° – θ) = sin θ]

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