Find the derivative.y = 18x sin 19x
A. 342x cos 19x + 18 sin 19x
B. 342x cos 19x + sin 19x
C. 342x cos 18x + 18 sin 19x
D. -342x cos 19x + 18 sin 19x
Answer: A
Mathematics
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+ 
A. 3
B. 3
C. 4
D. 4
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