An angle measuring 90° is called a(n) __________ angle.
Fill in the blank(s) with the appropriate word(s).
right
Mathematics
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Simplify the expression. Use positive exponents. Assume variables represent nonzero real numbers.
A. 
B. 
C. 
D. 
Mathematics
Graph the function over a one-period interval.y = - 
cos
+ 2
A. 
B. 
C. 
D. 
Mathematics
Solve. Give your answer as a mixed number if appropriate. 
= 
A. 20
B. 20
C. 20
D. 20
Mathematics
Evaluate.(
)1
A. 0
B. 
C. 1
D. 11
Mathematics