Use the unit circle to determine the value of the given expression or state that it is undefined.sec 
A. - 
B. -2
C. - 
D. 
Answer: A
Mathematics
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Prove that the equation is an identity.
= - cos12k cot 2k
What will be an ideal response?
Mathematics
Solve the equation in the complex number system.x2 + x + 2 = 0
A. {- 
- 
i, - 
+ 
i}
B. {
, 
}
C. {
, 
}
D. {
- 
i, 
+ 
i}
Mathematics
Factor the trinomial.21 - 10x + x2
A. (x - 3)(x + 7) B. (x + 3)(x + 7) C. (x - 21)(x - 1) D. (x - 3)(x - 7)
Mathematics
Simplify the rational expression. If the rational expression cannot be simplified, so state.
A. 
B. 
C. 
D. 
Mathematics