Write the product as a sum or difference containing only sines or cosines.cos 
cos 
A. 
[cos(6?) - sin(5?)]
B. 
cos2(11?)
C. 
[cos(5?) + cos(6?)]
D. 
[cos(12?) - sin(10?)]
Answer: C
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Evaluate the integral.
A. sin-1 (x + 2) + C
B. (2x + 4) ln |x2 + 4x + 20| + C
C. 
tan-1 
+ C
D. 
sin-1 
+ C
Calculate the arc length of the indicated portion of the curve r(t).r(t) = (9 - 2t)i + (5 + 9t)j + (6t - 9)k, -3 ? t ? 5
A. 242 B. 22 C. 88 D. 968
Check the following addition. If the answer is incorrect, give the correct answer.
2065
A. Incorrect; should be 2015 B. Correct C. Incorrect; should be 2165 D. Incorrect; should be 2155
Find the equation in standard form of the parabola described.The vertex has coordinates (1, 9), and the focus has coordinates (1, 6).
A. (y - 9)2 = -20(x - 1) B. (x - 1)2 = -12(y - 9) C. (x - 1)2 = 12(y - 9) D. (y - 9)2 = 20(x - 1)