x高次方公式，sin
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In=∫sin^nxdx=∫sin^(n-1)
x sinxdx=-∫sin^(n-1)
x dcosx=-cosxsin^(n-1)x+∫cosxdsin^(n-1)x=-cosxsin^(n-1)x+(n-1)∫cosxsin^(n-2)
xcosxdx=-cosxsin^(n-1)x+(n-1)∫cos²xsin^(n-2)xdx=-cosxsin^(n-1)x+(n-1)...
In=∫sin^nxdx=∫sin^(n-1)
x sinxdx=-∫sin^(n-1)
x dcosx=-cosxsin^(n-1)x+∫cosxdsin^(n-1)x=-cosxsin^(n-1)x+(n-1)∫cosxsin^(n-2)
xcosxdx=-cosxsin^(n-1)x+(n-1)∫cos²xsin^(n-2)xdx=-cosxsin^(n-1)x+(n-1)...
