Sum Difference Trig

Use Sum or Difference Identities to find the exact value of each expression.
cos(75°)

• 1/4

• √6/4 - √2 / 4

• √6 + √2 / 4

• -√6/4 - √2 / 4

Please choose the correct sum and difference formula:
cos (α-β) =

• sin α cos β + cos α sin β

• sin α cos β - cos α sin β

• cos α cos β - sin α sin β

• cos α cos β + sin α sin β

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)

• A
• B
• C
• D

Use a sum or difference formula to find an exact value of sin 105º

How can the sine of the sum of two angles be calculated?

• sin(α+β) = sinαcosβ + cosαsinβ

• sin(α+β) = sinαsinβ + cosαcosβ

• sin(α+β) = cosαcosβ - sinαsinβ

• sin(α+β) = cosαsinβ - sinαcosβ

Given tan α = 3/4 and tan β = (-1/2)

Please find the sum and difference:

tan (α-β)=

• 2

• 0.2588

• 0.9218

• cos(32°)

• cos(60°)

• sin(32°)

• sin(60°)