evaluate 8x, when x=7
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He started learning calculus when he was around twelve years old and had mastered it by the age of 15.
Isaac Newton. He invented Differential Calculus before the age of 26, and some say he continued to discover and explore it at the same rate that we learn about it today.
According to Wikipedia, his main manuscript on calculus, which he called fluxions, was published in October, 1666. He was 2 months short of 24 years of age at the time.
Calculus; by a long shot.
Just about all of calculus is based on differential and integral calculus, including Calculus 1! However, Calculus 1 is more likely to cover differential calculus, with integral calculus soon after. So there really isn't a right answer for this question.