Evaluate the expression.cot2 90° - sec 180°
A. 1
B. -1
C. 2
D. 0
Answer: A
Mathematics
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Find all square roots of the given number.9
A. -3
B. 3
C. ±3
D. 3
Mathematics
Add or subtract. Assume that variables represent nonnegative values.-5
+ 3
- 2
- 7
A. -7
- 4
B. 7
- 4
C. -7
+ 4
D. 7
+ 4
Mathematics
Provide an appropriate response.A student tried to clear the fractions in
+ 
= 10
+ 
= -9by multiplying both fractions by zero. Is this an acceptable approach?
Fill in the blank(s) with the appropriate word(s).
Mathematics
Divide and simplify to the form a + bi.
A. 
- 
i
B. 
+ 
i
C. 
- 
i
D. 
- 
i
Mathematics