Math 4: 4.6 to 4.8 Quiz Practice

cos(255)=

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• -1

• 1

• 0

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Given sin α = -3/5, cos α = -4/5 and cos β = (2√5)/5, sin β = (-√5)/5
Please find the sum or difference:
cos (α+β)=

• (-11√5)/25
• (-2√5)/25
• (√2-√6)/4
• 2

Tags

CCSS.HSF.TF.C.9

Given sin α = -3/5, cos α = -4/5 and cos β = (2√5)/5, sin β = (-√5)/5
Please find the sum or difference:
sin (α-β)=

• 0
• (-10√5)/25
• (√2-√6)/4
• (√8)/4

Tags

CCSS.HSF.TF.C.9

• A
• B
• C
• D

• A
• B
• C
• D

Solve the trigonometric equation sin² 2θ = 2sin²θ for θ in the interval [0, π/2)

• 0 and π/4
• 0 and π/6
• 0 and π/2
• π/3 and π/6

Tags

CCSS.HSF.TF.B.7

Solve the following equation for 0 ≤ x ≤ 2π.  sin 2x + sin x = 0

• x = 0, 2π/3, π, 4π/3
• x = 0, -2π/3, π, 4π/3
• x = 0, 2π/3, -π, 4π/3
• x = 0, 2π/3, π, -4π/3

Tags

CCSS.HSF.TF.B.7