Pre-Calc Review

8.  What is the period for y = 4cos(¹/₂x +π) - 2?

• pi/2
• pi
• 3pi
• 4pi

• 2π/5

• π

• 5

• 5π

5.  Write an equation for the cosine function with amplitude 3, period 2pi, phase shift of pi, and vertical shift of 5.

• y = 5cos(x - pi) + 3
• y = 3cos(x - pi) + 5
• y = 3cos(2x - pi) + 5
• y = 5cos(2x - pi) + 3

sin(5π/3)=

• 1/2
• -√3/2
• √3/2
• -1/2

sin(7π/4)

• 1/2
• -√2/2
• √2/2
• -1/2

cos 5π/6

• -1/2
• 1/2
• √3/2
• -√3/2

cos (π/4)

• √3/2
• √2/2
• 1/2
• 1