16
= 2sin²(x/2)/[2xsin(x/2)cos(x/2)]
= sin(x/2)/[xcos(x/2)]
= (1/2)sin(x/2)/[(x/2)cos(x/2)]
极限为1/2
17.
y' = [e^(-x/2)](-1/2)cos3x + [e^(-x/2)](-sin3x)*3
= -[(1/2)cos3x + 3sin3x][e^(-x/2)]
18.
= -(1/2)∫¹₀[e^(-x²)]d(-x²)
= (-1/2)e^(-x²)|¹₀
= (e - 1/e)/2
19.
= ∫¹₀(√x - x²)dx
= [(2/3)x^(3/2) - x³/3)|¹₀
= 2/3 - 1/3
= 1/3
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