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Cos sq 67-sinsq23

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Cos sq 67-sinsq23

Posted by Manish P Singh Pal 6 years, 2 months ago

CBSE > Class 10 > Mathematics

3 answers

Ansh Singh Singh 6 years, 2 months ago

Cos^2 67- Sin^2 23 Cos^2(90-23) - Sin^2 23 Sin^2 23 -Sin^2 23 0 Hence proved...

Pushkar Sahi 6 years, 2 months ago

cos sq67 - sin sq23 =cos sq(90-23) - sin sq23 =sin sq23-sin sq23 =0

Payal .....?? 6 years, 2 months ago

Cos²a 67 - cos²(90 - 23).................. Cos²a67 - cos² 67................ 0 is the answer

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