Question

Express the trigonometric ratios sinA in term of cosA​

Answer 1

sinA = ±
`√(1-cos^2A)`

Explanation:

Using the Pythagorean identity

sin²A + cos²A = 1 ( subtract cos²A from both sides )

sin²A = 1 - cos²A ( take the square root of both sides )

sinA = ±
`√(1-cos^2A)`