In a triangle ABC, the angle C is 90 degrees, sinA = √15 / 4. Find cosA

univerkov | March 17, 2021 | education

Determine the cosine of angle A.

Sin2A + Cos2A = 1.

Cos2A = 1 – Sin2A = 1 – 15/16 = 16/16 – 15/16 = 1/16.

CosA = 1/4.

Answer: The cosine of yy A is equal to 1/4.

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