微積分
find a formula for the area of a disk of radius r
Hints: the function f(x)=√(r平方-x平方) on 〔0,r〕
describes a quarter circle of radius r, substitute
u= sin^-1 (x/r)
ps.拜託善心的鄉民們~不是敝人平時不看書,而是已經離開書本四五年>"<
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