Complete the identity.sec4 x + sec2 x tan2 x - 2 tan4 x = ?
A. sec4 x + 2
B. tan2 x - 1
C. 3 sec4 x - 2
D. 4 sec4 x
Answer: C
Mathematics
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Find the derivative of the function.r = 
A. r ' = 
B. r ' = - 
C. r ' = 
D. r ' = 
Mathematics
Use the discriminant to determine the number of real solutions.t2 - 4t + 4 = 0
A. One real solution B. Two real solutions C. No real solutions
Mathematics
Write the decimal as a fraction or mixed number in lowest terms.6.4
A. 6
B. 
C. 6
D. 
Mathematics
Solve the problem.A force of 5 pounds acts in the direction of 5° to the horizontal. The force moves an object along a straight line from the point (5, 4) to the point (18, 13), with distance measured in feet. Find the work done by the force. Round the answer to one decimal place, if necessary.
A. 79.1 ft-lb B. 15.8 ft-lb C. 78.8 ft-lb D. 109.6 ft-lb
Mathematics