Double Angle Identities Equations Trig

Solve for theta.

• A

• B

• C

• D

Solve for theta.

• A

• B

• C

• D

Solve for theta.

• A

• B

• C

• D

Solve for theta.

• A

• B

• C

• D

Using the fourth identity, find Cos(120)

• 2sin²(120)

• 1+2sin²(120)

• 1+2sin²(60)

• 1-2sin²(60)

Use a double-angle identity to find the exact value of each expression cos θ = 4/5 and 270° < θ < 360° Find sin 2θ

Using the third identity, find Cos(40)

• 2cos² (40) - 1

• 2cos² (20) - 1

• 2cos² (20) + 1

• 2cos² (40) + 1

Use a double-angle to find the exact value of each expression cos θ = 4/5 and 270° < θ < 360°Find sin 2θ

• -1/5

• 24/25

• -24/25

• -25/24

Use a double-angle identity to find the exact value of each expression cos θ = 4/5 and 270° < θ < 360° Find sin 2θ