Evaluate for theta between 0 and 2pi

What is the reciprocal of secant in trigonometry?

• Sine

• Cosine

• Tangent

• Cosecant

Why is it easier to work with cosine instead of secant when using the unit circle?

• Secant is not defined on the unit circle.

• Cosine values are always positive.

• Cosine is easier to visualize on the unit circle.

• Cosine and secant are the same.

At which angle in the first quadrant is cosine equal to 1/2?

• π/2

• π/6

• π/3

• π/4

What is the cosine value at the angle 4π/3?

• -1/2

• -√3/2

• √3/2

• 1/2

Which of the following angles is a reflection over the Y-axis where cosine equals -1/2?

• π/6

• 5π/6

• 2π/3

• π/3