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Cos cos square 75 + cos square 15 equal to 1 proof

Posted by Dharmendar Yadav 6 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Ananya Aggarwal 6 years, 4 months ago

Cos2 75 +cos2 15 = 1 Cos2 (90-15) + cos2 15=1 Sin2 15 + cos2 15 = 1 (sin2Q + cos2Q = 1) Hence, sin2 15 +cos2 15=1 1=1

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