Verify Cofunction Identity using Difference Formula

The video tutorial covers cofunction identities, focusing on the relationship between sine and cosine. It discusses common mistakes made in quizzes, particularly with secant and cosecant. The instructor introduces sum and difference formulas to verify identities and demonstrates their application. The session concludes with a preference for understanding transformations through graphs rather than memorization.

What is the cofunction identity of secant?

• Cosecant

• Tangent

• Cosine

• Sine

Which formula can be used to verify trigonometric identities by making the left side look like the right side?

• Pythagorean Theorem

• Quadratic Formula

• Law of Sines

• Sum and Difference Formulas

When dealing with the addition or subtraction of angles, what should you avoid doing?

• Applying the Pythagorean identity

• Using the tangent function

• Distributing

• Using the cofunction identity

What is the value of cosine of π/2?

• 1

• 0

• -1

• Undefined

According to the teacher, what is a preferred method to understand trigonometric identities?

• Memorizing formulas

• Looking at transformations in the graph

• Reading textbooks

• Using a calculator