Question

Sin2 25 + sin2 65 + sin2 50 + sin2 40

Answer 1

Explanation:

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Answer 2

Answer:

Sin 2 25 = cos2 (90-25)=cos2 65

sin2 50 = cos2 ( 90-50)= cos2 40

replacing the value we get,

(cos2 65 + sin2 65) + (cos2 40 + sin2 40)

we know , sin2 a + cos2 a = 1

= 1+1

= 2 ans.