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Mathematics

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The position vector of a particle is r(t). Find the requested vector.The acceleration at t =  for r(t) = (9 sin 2t)i  - (8 cos 2t)j + (9 csc 2t)k

A. a = -36i - 36k
B. a = -36i + 36k
C. a = 36i + 36k
D. a = 32j + 36k

Mathematics

Find the exact value of the expression.sin 20° cos 100° + cos 20° sin 100°

A.
B.
C. - 
D. - 

Mathematics

Solve the problem.Two pulleys of diameter 9 m and 3 m are connected by a belt. The larger pulley rotates 44 times per min. Find the angular velocity of the smaller pulley.

A. 132? radians/min B. 396? radians/min C. 198? radians/min D. 264? radians/min

Mathematics

Simplify the expression. If any variables are present, assume that they are positive.

A. y
B. y2
C. y2
D. y2

Mathematics