Mathematics & Statistics
Undergraduate
Resolved
想問一下這個，謝謝🙏
12xxx (題目)
S
dx
2+9x2
du
a*+ u²
=
云arctana+c
C h i l 116 i d' 4 in u=3x+α= √
以
個公式來說
為何答案不是应
a=
aretan 3X
fc
而是和
I
3X
arctan
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