Find the exact value by using a sum or difference identity.cos 
cos 
+ sin 
sin 
A. 
B. - 1
C. 
D. 
Answer: D
Mathematics
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Solve the problem.A region in the first quadrant is bounded above by the curve y = tanh x, below by the 
on the left by the 
and on the right by the line 
Find the volume of the solid generated by revolving the region about the x-axis.
A. ?
B. 2?
C. 0
D. - 
Mathematics
Use Stokes' Theorem to calculate the circulation of the field F around the curve C in the indicated direction.F = -3yi - 5xj - 2z3k ; C: the portion of the plane 8x + 8y + 3z = 8 in the first quadrant
A. -2 B. - 1 C. 1 D. 0
Mathematics
Factor completely. If the polynomial cannot be factored, say it is prime.12x3 + 7x2 - 12x
A. x(4x + 4)(3x - 3) B. x2(3x + 4)(4x - 3) C. x(3x + 4)(4x - 3) D. (3x2 + 4)(4x - 3)
Mathematics
Find the quotient.
÷ 
A. 
B. - 
C. 
D. - 
Mathematics