Find value of cos 55 +cos 125+ cos 300
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Your answer is __________________
=Here, cos55 + cos125 + cos300
=cos(90 - 35) + cos (90+35)+ cos (270+30)
=sin35 - sin35 + sin30 ( in 2nd quadrant theta is negative)
=sin 30
=1/2 answer.
Your answer is __________________
=Here, cos55 + cos125 + cos300
=cos(90 - 35) + cos (90+35)+ cos (270+30)
=sin35 - sin35 + sin30 ( in 2nd quadrant theta is negative)
=sin 30
=1/2 answer.
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