Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.-20
A. 1
B. -2
C. 0
D. -1
Answer: D
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If 
and 
, find a formula for
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.
?
A. 0
B. 
C. 
D. 
Solve the problem.When an alternating current passes through a series RLC circuit, the voltage and current are out of phase by angle ?. Here ? = tan-1[(XL - XC)/R], where XL and XC are the reactances of the inductor and capacitor, respectively, and R is the resistance. Find d?/dXL for constant XC and R.
A. 
B. 
C. 
D. 
Solve the problem.Fill in the blank.11
+ 2
= (11 + 2)
is an example of the ___________ property.
A. inverse B. associative C. distributive D. commutative
Find the exact value by using a half-angle identity.tan 75°
A. 2 - 
B. -2 + 
C. 2 + 
D. -2 - 