The video tutorial explains trigonometric functions using a unit circle. It covers sine, cosine, tangent, secant, cotangent, and cosecant, showing their relationships through triangle similarity. The tutorial also discusses complementary angles, the behavior of trig functions as the angle theta changes, and derives Pythagorean identities. The video concludes with a visualization of these concepts, helping learners understand and remember trigonometric functions.

What is the vertical distance from a point on the unit circle to the x-axis called?

• Cosine

• Secant

• Tangent

• Sine

If the angle is theta, what are the coordinates of the point on the unit circle?

• (secant theta, tangent theta)

• (tangent theta, secant theta)

• (cosine theta, sine theta)

• (sine theta, cosine theta)

What is the tangent of theta defined as in terms of sine and cosine?

• Cosine divided by sine

• Cosine times sine

• Sine divided by cosine

• Sine times cosine

What is the secant of theta defined as?

• 1 divided by sine

• 1 divided by cosine

• Sine divided by cosine

• Cosine divided by sine

What is the cotangent of theta defined as?

• 1 divided by cosine

• 1 divided by sine

• Sine divided by cosine

• Cosine divided by sine

Which trigonometric functions are undefined at theta equals pi over 2?

• Sine and secant

• Cotangent and cosecant

• Tangent and secant

• Sine and cosine

What is the range of the sine and cosine functions?

• Between -1 and 0

• Between 0 and 1

• Between -1 and 1

• Between -2 and 2

Which identity is derived from the Pythagorean theorem involving sine and cosine?

• Cotangent squared plus cosecant squared equals 1

• Tangent squared plus secant squared equals 1

• Sine squared plus cosine squared equals 1

• Sine squared minus cosine squared equals 1

What does the prefix 'co-' in trigonometric terms stand for?

• Complementary

• Cosine

• Constant

• Coordinate

What is the relationship between the cosine of an angle and the sine of its complementary angle?

• They are equal

• They are unrelated

• They are opposites

• One is double the other