What is the value of Sinsquare9°+ Sinsquare81°
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Answer:
Hence, the required answer = 1
Step-by-step explanation:
Given,
sin^2 9° + sin^2 81°
We know that,
sin(90 - theta) = cos theta
= sin^2(90° - 81°) + sin^2 81°
= cos^2 81° + sin^2 81°
Also,
sin^2 theta + cos^2 theta = 1
Then,
cos^2 81° + sin^2 81° = 1
Hence, the required answer = 1
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