Find Dxy.y = tanh2 9x
A. 18 tanh 9x sech2 9x
B. 18 tanh2 9x sech 9x
C. - 18 tanh 9x csch2 9x
D. 2 tanh 9x sech2 9x
Answer: A
Mathematics
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Perform the indicated operation.The voltage E (in V) in a circuit with a battery of resistance R , a current i, and an inductance L, is 
, where t is the time after the circuit is closed. Find E for R = 1.238 ?, i = 0.00152 A, L = 3.287 H, and t = 0.00600 s to three significant digits.
A. 0.000940 B. 0.000942 C. 0.834 D. -0.832
Mathematics
Evaluate.i38
A. i B. 1 C. -1 D. -i
Mathematics
Evaluate
Mathematics
Multiply. Change any mixed number to an improper fraction before multiplying.2 × 3
A. 7
B. 6
C. 6
D. 6
Mathematics