Determine if the equation is an identity.cos (A + B) + cos (A - B) = 2 sin A sin B
A. Yes
B. No
Answer: B
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Using Green's Theorem, compute the counterclockwise circulation of F around the closed curve C.F = ln (x2 + y2)i + tan-1 
j; C is the region defined by the polar coordinate inequalities 1 ? r ? 8 and 
A. 0 B. 65 C. -14 D. 126
Solve the problem.Suppose that an object's acceleration function is given by 
The object's initial velocity is 4, and the initial position is 9. Find the object's displacement as a function of time.
A. s = 
t3 + 3t2 + 4t
B. s = 
t3 + 3t2 + 9t + 4
C. s = 2t2 + 6t + 4
D. s = 
t3 + 3t2 + 4t + 9
Solve.24x2 + 17x = -8x2 + 5x
A. 0, 
B. 0, - 
C. 4, - 
D. -4, 
Find the exact value under the given conditions.Given sin ? = - 
, with ? in quadrant IV, and tan ? = - 
, with ? in quadrant II. Find sec (? + ?).
A. - 
B. - 
C. 
D. - 