Double Angle Identities

Which is equivalent to: 
sin(2θ)

• ½sinθ/cosθ
• sinθcosθ/2
• 2sinθcosθ
• 2sin²θ-cos²θ

Which is equivalent to:
cos(2θ)

• cos²θ-sin²θ
• 2sinθcos
• 2cos²+1
• sin²θ-1

Tags

CCSS.HSF.TF.C.9

Which is equivalent to:
tan(2θ)

• 2cos²θ/1-sin²θ
• sin²θ/cos²θ
• 2tanθ/1-tan²θ
• 2/cotθ+tanθ

Tags

CCSS.HSF.TF.C.9

Given:  sin θ = −3/5 
and 3π/2 < θ < 2π, Find tan 2θ

• -24/7
• 24/7
• 1
• -1
  -3/4

Given:    cos θ = 4/5 and
                270° < θ < 360°
                  Find sin 2θ

• -1/5
• 24/25
• -24/25
• -25/24

Tags

CCSS.HSF.TF.C.9

Given: sinx = 5/13 in QII, find cos2x

• 7/13
• -120/119
• -120/169
• 119/169

Tags

CCSS.HSF.TF.C.9

Given cotx = -4 in QIV, find tan2x

• -8/15
• -8/17
• 15/17
• -2/3

Given cosx = -2/3 in QII, find cos2x.

• -21/9
• 21/9
• 1/9
• -1/9

Tags

CCSS.HSF.TF.C.9