Question

What is the value of Sinsquare9°+ Sinsquare81°​

Answer 1

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