u = sin(1/3x3)*e(2x+1)
u ´ = cos(1/3x^3) * x^2 * e^{2x+1} + sin(1/3x^3) * e^{2x+1} * 2
v = 7x2-cos(2/x)
v ´= 14x + sin(2/x) * ( -2/x^2 )
u / v = [ ( u´ * v ) - ( u * v ´) ] / v^2
(
[ ( cos(1/3x^3) * x^2 * e^{2x+1} + sin(1/3x^3) * e^{2x+1} * 2 ] * [ 7x2-cos(2/x) ] { u´ * v }
- [ sin(1/3x3)*e(2x+1) ] * [ 14x + sin(2/x) * ( -2/x^2 ) ] { u * v´ }
)
/ ( 7x2-cos(2/x) ) { v^2 }
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