Evaluate the integral which is given in cylindrical or spherical coordinates.
A. 
B. 
C. 
?
D. 
?
Answer: C
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Solve.65 ? t = 0
A. t = 1 B. no solution C. t = 0 D. t = 65
Write the sum or difference as a product containing only sines and/or cosines.cos(6?) - cos(2?)
A. -2 sin(4?) sin(2?) B. -2 cos(4?) sin(2?) C. 2 cos(4?) cos(2?) D. 2 cos(2?)
Solve the problem.The charges for renting a moving van are $65 for the first 40 miles and $5 for each additional mile. Assume that a fraction of a mile is rounded up. (i) Determine the cost of driving the van 84 miles. (ii) Find a symbolic representation for a function f that computes the cost of driving the van x miles, where 
(Hint: express f as a piecewise-constant function.)
A. $285; f(x) = 
B. $5680; f(x) = 
C. $685; f(x) = 
D. $685; f(x) = 
Rationalize the denominator. Assume all variables represent positive real numbers.
A. 
B. 
C. -1
D. 22