Question

if tan A = root 2 - 1 find sinAxcosA

Answer 1

Step-by-step explanation:

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Answer 2

Ans -
Tan a = root 2 - 1
tan a + 1 = root 2
Sin a + cos a = root 2 cos a
1 + 2 sin a. Cos a = 2 cos^2 a
2 sin a . cos a = 2 cos^2 a - 1
Sin a . Cos a = (cos 2a) / 2