cos24 + cos 55 + cos125 + cos 204 + cos 300 = 1/2. prove it .
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Explanation:
Cos 24+ cos 55+ cos 125+ cos 204+ cos 300
=cos 24+ cos 55- cos 55- cos 24+ sin 30
( cos 125= -cos 55 as it is in 2nd quadrant)
( cos 204= -cos 24 as it is in 3rd quadrant)
= sin 30
= 1/2
PROVED
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Cos 24+ cos 55+ cos 125+ cos 204+ cos 300
=cos 24+ cos 55- cos 55- cos 24+ sin 30
( cos 125= -cos 55 as it is in 2nd quadrant)
( cos 204= -cos 24 as it is in 3rd quadrant)
= sin 30
= 1/2
PROVED
If it helps... thank me and mark me brainliest
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