Evaluate the following expression.
?
cos2 ? - sin2 ?
?
A. 1 + 2 sin2 ?
B. 1 + 2 cos2 ?
C. 2 cos2 ? - 1
D. 2 sin2 ? - 1
E. 1 - 2 cos2 ?
Answer: C
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Find the value.If F(x, y) = ln (x2 + y2), find Fx(1, 3) and Fy(1, 3).
A. Fx(1, 3) = 
, Fy(1, 3) = 
B. Fx(1, 3) = 
, Fy(1, 3) = 
C. Fx(1, 3) = 
, Fy(1, 3) = 
D. Fx(1, 3) = 
, Fy(1, 3) = 
The equation gives the position s = f(t) of a body moving on a coordinate line (s in meters, t in seconds).s = -1 + 9 cos tFind the body's jerk at time t = ?/3 sec.
A. - 
m/sec3
B. 
m/sec3
C. 
m/sec3
D. - 
m/sec3
Show the solution set of each inequality on a number line.2 ? x ? 6
A. 
B. 
C. 
D. 
Solve the problem.Jessie has a ribbon that is 4.8 yards long. He wants to cut it into pieces that are 0.8 yards long. How many 0.8-yard pieces will he get from the ribbon?
A. 7 pieces B. 6 pieces C. 5 pieces D. 60 pieces