Perform the indicated operation. 
÷ 
A. 
B. 
C. 
D. 
Answer: D
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Match the vector equation with the correct graph.
r(t) = 2 cos ti + sin tk; 0 ? t ? ?
A. Figure 4 B. Figure 2 C. Figure 7 D. Figure 6
List the intercepts of the graph.Tell whether the graph is symmetric with respect to the x-axis, y-axis, origin, or none of these. 
A. intercepts: (0, -5) and (0, 5) symmetric with respect to y-axis B. intercepts: (0, -5) and (0, 5) symmetric with respect to x-axis, y-axis, and origin C. intercepts: (-5, 0) and (5, 0) symmetric with respect to x-axis, y-axis, and origin D. intercepts: (-5, 0) and (5, 0) symmetric with respect to origin
Find the exact value of the expression.
A. - 
B. - 
C. -2
D. -
Use an identity to write the expression as a single trigonometric function or as a single number.± 
A. cos 17? B. sin 68? C. cos 68? D. sin 17?