Find the indicated series by the given operation.Show that by differentiating term by term the expansion of 
the result is the expansion for 
A. 
(1 + 2x - 3x2 + 4x3 - . . .) = -2(1 + 3x - 6x2 + . . . )
B. 
(2x + 3x2 - 4x3 + . . .) = -2(1 - 3x + 6x2 - . . .)
C. 
(1 - 4x + 6x2 - 8x3 + . . .) = -2( 2 - 6x + 12x2 - . . .)
D. 
(1 - 2x + 3x2 - 4x3 + . . .) = -2(1 - 3x + 6x2 - . . .)
Answer: D
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Classify the angle as acute, obtuse, straight, or right.
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