Section 8.5 Sum & Difference Formulas

Find the exact value of the expression.
cos(20)cos(40) - sin(20)sin(40)

• 1/4
• 1/2
• √(3)/2
• √(3)

sinα cosβ + cosα sinβ =

• sin (α + β)

• sin (α - β)

• cos (α + β)

• cos (α - β)

cosα cosβ + sinα sinβ =

• sin (α + β)

• sin (α - β)

• cos (α + β)

• cos (α - β)

cosα cosβ - sinα sinβ =

• sin (α + β)

• sin (α - β)

• cos (α + β)

• cos (α - β)

sinα cosβ - cosα sinβ =

• sin (α + β)

• sin (α - β)

• cos (α + β)

• cos (α - β)

• tan (a + b)

• tan (a - b)

• cos (a + b)

• cos (a - b)

• tan (a + b)

• tan (a - b)

• cos (a + b)

• cos (a - b)

Write the following expression as the sine, cosine, or tangent of an angle.
cos(175)cos(55)+sin(175)sin(55)

• sin(120)
• cos(120)
• cos(230)
• sin(230)

Find the exact value of the expression.
sin(5π/12)cos(π/4) - cos(5π/12)sin(π/4)

• 1/2
• -1/2
• -√(2)/2
• √(3)/2

• A
• B
• C
• D

Tags

CCSS.HSF.TF.C.9