What is the value of cos^2 77° - sin^2 13°
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Answered by
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it's value Will be zero
shrutipatel16:
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Answered by
11
Answer:
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Step-by-step explanation:
cos^2 77° - sin^2 13°
cos^2 (90-77)° - sin^2 13°
cos (90- theta) = sin theta
cos^2 13° - sin^2 13° = 0
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