Solve.An equation used in the study of Class C amplifiers is R = 
,where R is the internal resistance of the tube and ? is the angle that indicates the portion of the cycle during which the current is allowed to flow. Express R in terms of sin ? and cos ?; in other words, eliminate the double angle.
A. R = 
B. R = 
C. R = 
D. R = 
Answer: C
Mathematics
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Determine how many terms should be used to estimate the sum of the entire series with an error of less than 0.001.
A. n ? 45 B. n ? 43 C. n ? 44 D. n ? 42
Mathematics
Write in logarithmic form.
-3 = 
A. 
= 
B. log3
= 
C. log4/11
= -3
D. log-3
= 
Mathematics
Perform the indicated operations and simplify the result. Leave the answer in factored form.
+ 
A. 
B. 
C. 
D. 
Mathematics
Multiply. Simplify if possible.
? 
A. 
B. 
C. 
D. 
Mathematics