How to use trig identities and cofunction to evaluate trig functions

The video tutorial covers the relationships between sine, cosine, and tangent using the unit circle. It explains how to calculate the tangent and cotangent of 60 degrees and introduces cofunction identities to find sine and cosine values for 30 and 60 degrees. The tutorial emphasizes understanding trigonometric functions and their interrelations.

How is the tangent of an angle related to its sine and cosine?

• Tangent is the ratio of sine to cosine.

• Tangent is the difference between sine and cosine.

• Tangent is the product of sine and cosine.

• Tangent is the sum of sine and cosine.

What is the value of tangent for 60 degrees?

• sqrt 3

• sqrt 3 / 3

• 1

• 1/2

How is cotangent related to tangent?

• Cotangent is the sum of tangent and sine.

• Cotangent is the reciprocal of tangent.

• Cotangent is the difference between tangent and cosine.

• Cotangent is the square of tangent.

What is the cotangent of 60 degrees after rationalizing the denominator?

• sqrt 3 / 3

• 1 / sqrt 3

• sqrt 3

• 1

Using cofunction identities, what is the sine of 30 degrees equivalent to?

• Sine of 60 degrees

• Cosine of 60 degrees

• Sine of 90 degrees

• Cosine of 30 degrees