HW 4.2 Trig Functions

Front

What is the value of cos based on the unit circle?

Back

x

Front

In which quadrants is cosine positive?

Back

the 1st and 4th quadrants

Front

What is the period for sin and cos (how often do they repeat)?

Back

Front

What is the value of sin based on the unit circle?

Back

y

Front

What is the value of sin 30°?

Back

Front

Define the unit circle in trigonometry.

Back

A circle with a radius of 1 centered at the origin (0,0) in the coordinate plane.

Front

What is the relationship between sine and cosine in a right triangle?

Back

sin(θ) = opposite/hypotenuse, cos(θ) = adjacent/hypotenuse.

Front

What is the sine of 90°?

Back

1

Front

What is the cosine of 0°?

Back

1

Front

What is the tangent function in terms of sine and cosine?

Back

tan(θ) = sin(θ)/cos(θ).