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v=2x+3 v'=2
f'=u'v-uv'/v^2
f'=-8x(2x+3)-(5-4x^2)2/(2x+3)^2
f'=(-16x^2-24x-10+8x^2)/(2x+3)^2
f'=(-8x^2-24x-10)/(2x+3)^2
semoga membantu ya ^_^