SSC CGL 16 Aug 2015 Shift 2 Paper

Question : 140 of 200

Marks: +1, -0

The value of the following is :
cos 24° + cos 55° + cos 125° + cos 204° + cos 300°

$1/2$
2
1
- $1/2$

Solution:

Expression = cos 24° + cos 55° + cos 125° + cos 204° + cos 300°
= cos 24° + cos 55° + cos (180° – 55°) + cos (180° + 24°) + cos (360° – 60°)
= cos 24° + cos 55° – cos 55° – cos 24° + cos 60°
= cos 60° =

1/2

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