Let f be a differentiable function such that f'(x)=7-3/4*(f(x))/(x), (x>0) and f(1)ne 4. Then lim_(xrightarrow 0^+)x*f(1/x): A)does not exist. B)exists and equals 4. C)exists and equals 4/7. D)exists and equals 0.

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The solution of a differential equation y′′+3y′+2y=0 is of the form
A) $c_1{e}^x+c_2{e}^{2x}$
B) $c_1{e}^{-<!--\; -\; -->x}+c_2{e}^{3x}$
C) $c_1{e}^{-<!--\; -\; -->x}+c_2{e}^{-<!--\; -\; -->2x}$
D) $c_1{e}^{-<!--\; -\; -->2x}+c_2{2}^{-<!--\; -\; -->x}$

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Look at this series: 1.5, 2.3, 3.1, 3.9, ... What number should come next?
A. 4.2
B. 4.4
C. 4.7
D. 5.1

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The differential coefficient of $\sec \left({\tan }^{-1}\left(x\right)\right)$.