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misal:
u=2x+5 ---> u' 2
v=4x+3 ---> v'=4
f(x) = u/v
f'(x) = u'v-uv' / v²
= 2(4x+3)-4(2x+5) / (4x+3)²
= 8x+6-8x-20 / (4x+3)²
= -14 / (4x+3)²