Complete the identity.8 sin x cos3 x + 8 sin3 x cos x = ?
A. 4 sin 2x
B. 4 cos 2x
C. 4 cos x
D. 4 sin x
Answer: A
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Solve the problem.A ramp leading to the entrance of a building is inclined upward at an angle of 9°. A suitcase is to be pulled up the ramp by a handle that makes an angle of 27° with the horizontal. How much force must be applied in the direction of the handle so that the component of the force parallel to the ramp is 50 lbs.?
A. 51.66 lbs B. 55.43 lbs C. 47.55 lbs D. 155.9 lbs
Solve.Find the Maclaurin series for 
A. 1 + 8x2 + 
x4 + . . .
B. 1 - 8x2 + 
x4 - . . .
C. 4x + 
x3 + 
x5 + . . .
D. 4x - 
x3 + 
x5 - . . .
Perform the indicated operation and simplify.
+ 
A. 
B. 
C. 6m - 7
D. 
Find the second-order partial derivative.Find fxy when f(x,y) = 10x2y4 - 7x3y5.
A. 80xy3 - 21x2y4 B. 160xy3 - 21x2y4 C. 80xy3 - 105x2y4 D. 160xy3 - 105x2y4