Write the complex number in rectangular form.3(cos 225° + i sin 225°)
A. 
+ 
i
B. 
+ 
i
C. 
+ 
i
D. 
+ 
i
Answer: D
Mathematics
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Multiply and simplify.(sin ? - 1)(sin ? + 1)
A. cos2? B. - cos2? C. - cos2? - 2 sin ? D. cos2? - 2 sin ?
Mathematics
Find the exact value of the expression or state that it does not exist.cos-1
A. 
B. 
C. 
D. 
Mathematics
Simplify the exponential expression. Assume that variables represent nonzero real numbers.33 ? 5
A. 45 B. 135 C. 3375 D. 32
Mathematics
Solve the problem. Round to the nearest hundredth, if necessary.72 is 90% of what number?
A. 800 B. 64.8 C. 80 D. 8
Mathematics