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jarak = √(a-0)² + ( -a² +36 -10)²
= √( a² + a^4 -52 a² + 26²) = √( a^4 -51a²+ 26²)
turunan = 0 (maks/min) ... 1/2(( a^4 -51a²+ 26²)^(-1/2) . (4a^3-102a) =0
jadi yang = 0 ... pasti pembilangnya. .... 2a(2a² - 51)=0 ...... a=0 atau a=51/2
jarak = √ 26² =26 untuk a=0