PCH 12/18; Do Now

Front

What is the sum and difference formula for cos(α - β)?

Back

cos(α - β) = cos α cos β + sin α sin β

Front

What is the formula for tan(A - B)?

Back

tan(A - B) = \frac{tan A - tan B}{1 + tan A tan B}

Front

Define the cosine function in terms of a right triangle.

Back

In a right triangle, cos(θ) = adjacent side / hypotenuse.

Front

What is the sine function in terms of a right triangle?

Back

In a right triangle, sin(θ) = opposite side / hypotenuse.

Front

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

Back

tan(θ) = \frac{sin(θ)}{cos(θ)}.

Front

State the Pythagorean identity involving sine and cosine.

Back

sin²(θ) + cos²(θ) = 1.

Front

What is the angle addition formula for sine?

Back

sin(α + β) = sin α cos β + cos α sin β.

Front

What is the angle addition formula for cosine?

Back

cos(α + β) = cos α cos β - sin α sin β.

Front

How do you convert degrees to radians?

Back

Radians = Degrees × (π / 180).

Front

What is the relationship between the unit circle and trigonometric functions?

Back

The coordinates of a point on the unit circle correspond to the values of cos(θ) and sin(θ).