Simplify the expression.cos(x - y) cos y + sin(x - y) sin y
A. cos(x + 2y)
B. cos x
C. sin x
D. cos(x - 2y)
Answer: B
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Find the exact value of the expression.tan-1
A. 
B. 
C. 
D. 
Decide whether or not the correct factored form of the polynomial is given.15z2 - 14z - 8(3z - 4)(5z + 2)
A. No B. Yes
Write the expression in expanded form.ln
A. ln(x4(5x + 2)2) - ln(
(x - 2)-2(x + 1)3)
B. 4 ln x + 2 ln(5x + 2) - 
ln(x3 + 3) - 2 ln(x - 2) + 3 ln(x + 1)
C. ln x4 + ln(5x + 2)2 - ln
+ ln(x - 2)2 - ln(x + 1)3
D. 4 ln x + 2 ln(5x + 2) - 
ln(x3 + 3) + 2 ln(x - 2) - 3 ln(x + 1)
Find the first term, the common difference, and give a recursive formula for the arithmetic sequence.6th term is -10; 15th term is -46
A. a1 = 10, d = 4, an = an-1 + 4 B. a1 = 10, d = -4, an = an-1 - 4 C. a1 = -10, d = -4, an = an-1 - 4 D. a1 = -30, d = 4, an = an-1 + 4