?
Find the cofactor A12 of the matrix.
?
A. 
B. 
C. 
D. 
E. none of these
Answer: A
Mathematics
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Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 1
B. 
C. 
D. 
Mathematics
Find the critical number(s), if any, of the function 
a. 4 b. ?4 c. ±?7 d. ±7
Mathematics
Solve the quadratic equation.
Use the following property:For any real number a, 
if and only if 
or
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A. 
B. 
C. 
D. 
E. 
Mathematics
Find the product. Leave answer reduced to lowest terms, and assume that all variables have nonzero values.
? 
A. 
B. 
C. 
D. 
Mathematics