Trigonometric Identities and Functions

What is the negative angle identity for cotangent?

• cot(-x) = -1/cot(x)

• cot(-x) = -cot(x)

• cot(-x) = cot(x)

• cot(-x) = 1/cot(x)

How can cotangent be expressed in terms of sine and cosine?

• cot(x) = cos(x)/sin(x)

• cot(x) = sin(x)/cos(x)

• cot(x) = 1/sin(x)

• cot(x) = 1/cos(x)

What is the common denominator used for the subtraction in the expression?

• sec(x)

• sin(x)

• tan(x)

• cos(x)

What is the result of subtracting -cos^2(x)/sin(x) and -sin^2(x)/sin(x)?

• (cos^2(x) + sin^2(x))/sin(x)

• -(cos^2(x) - sin^2(x))/sin(x)

• (cos^2(x) - sin^2(x))/sin(x)

• -(cos^2(x) + sin^2(x))/sin(x)

What identity is used to simplify cos^2(x) + sin^2(x)?

• cos^2(x) + sin^2(x) = 0

• cos^2(x) + sin^2(x) = 2

• cos^2(x) + sin^2(x) = 1

• cos^2(x) + sin^2(x) = -1