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d (t) = - t² + 4t + 1
d' (t) = - 2t + 4
0 = - 2t + 4
2t = 4
t = 4/2
t = 2
nilai maks = - 2² + 4.2 + 1
= - 4 + 8 + 1
= 4 + 1
= 5