Use the sum and difference identities to evaluate exactly.cos 
A. - 
(
- 1)
B. - 
C. 
D. 
(
- 1)
Answer: C
Mathematics
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Use the Chain Rule or implicit differentiation to find the indicated derivative.x4 - 2x3 + xy2 - y3 = 0. Find 
.
A. 
B. 
C. 
D. 
Mathematics
Find the intervals on which the function is continuous.y = 
A. continuous everywhere
B. discontinuous only when ? = 7
C. discontinuous only when ? = 
D. discontinuous only when ? = -7
Mathematics
Simplify the expression using positive exponents only.
3
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression. Write your answer with only positive exponents. Assume that all variables represent nonzero real numbers.
4
A. 
B. 
C. 
D. 
Mathematics