Math, asked by sudhirkr878, 1 month ago

find the value of cos^2 13cos^2 47 +cos^2 73

Answers

Answered by Anonymous

1

cos2 73º + cos2 47º - sin2 43º + sin2 107º

= cos2 (90 – 17) + cos2 (90 – 43) – sin2 43) + sin2 (90 + 17) = sin217 + sin243 – sin243 + cos217 = 1

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