Find the unit tangent vector of the given curve.r(t) = (7 sin3 7t)i + (7 cos3 7t)j
A. T = (7 sin 7t)i - (7 cos 7t)j
B. T = (sin 7t)i - (cos 7t)j
C. T = (147 sin 7t)i -(147 cos 7t)j
D. T = (7 cos 7t)i - (7 sin 7t)j
Answer: B
Mathematics
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- 
A. 
a - 
b
B. 
a + 
b
C. 
a - 
b
D. 
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Solve.The sum of twice a number and 18 less than the number is the same as the difference between -2 and the number. What is the number?
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Perform the indicated operation and simplify.
- 
A. 
B. 
C. 
D. 
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