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b. Luas segitiga 1= 1/2.4,5.6=13,5
luas segitiga 2=1/2.5.3,75=9,375
batas kurvanya 0-5
luasnya =integral0-5(2x+3)
=[x^2+3x]0-5
=[5^2+3(5)]-[0^2+3(0)]
=25+15
=40 satuan