Identities double angle formula

Using the first identity, find Sin(180)

• 2sin(90)cos(90)
• 2sin(180)cos(180)
• sin(90)cos(90)
• sin(180)cos(180)

Tags

CCSS.HSF.TF.C.9

Using the second identity, find Cos(50)

• sin²(25) - cos²(25) 
• cos²(50) - sin²(50)
• cos²(25) - sin²(25)
• sin²(50) - cos²(50) 

Tags

CCSS.HSF.TF.C.9

Using the fourth identity, find Cos(120)

• 1-2sin²(120)
• 1+2sin²(120)
• 1+2sin²(60)
• 1-2sin²(60)

Tags

CCSS.HSF.TF.C.9

Using the second identity, find Cos(2π)

• sin²(π) - cos²(π) 
• cos²(π) - sin²(π)
• cos²(2π) - sin²(2π)
• sin(2π)cos(2π)

Tags

CCSS.HSF.TF.C.9

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)

Tags

CCSS.HSF.TF.C.9

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

Tags

CCSS.HSF.TF.C.9

• A
• B
• C
• D

Tags

CCSS.HSF.TF.C.9

Simplify.

• sin²θ
• cosθ
• tanθ
• 1- sin²θ

Tags

CCSS.HSF.TF.C.8

Simplify.

• csc²θ
• sec²θ
• cscθ
• 1

Tags

CCSS.HSF.TF.C.8

Simplify.

• sinθ
• cot²θ
• tan²θ
• cos²θ

Tags

CCSS.HSF.TF.C.8