Trigonometric Identities

• 1

• tanx

• cotx

• cosx

• sinx

• cosx

• 1

• tanx

cosxcscx

• tanx

• secx

• sinx

• cotx

*

• csc x

• sec x

• cot x

• tan x

• Converting all functions to sine and cosine

• Using the Pythagorean identity

• Applying the sum and difference identities

• sin(x) - cos(x)

• -cot(x) - sec(x)

• cot(x) - sec(x)

• -sin(x) - cos(x)

Which of the following is NOT a pythagorean identity?

• sin²x + cos²x = 1

• 1 - cos²x = sin²x

• 1 - sin²x = cos² x

• sin²x - cos²x = -1

• sin²θ/cos²θ

• 1

• 0

• cos²θ/sin²θ