Mathematics
Senior High
Solved
積分のやり方が分かりません。部分積分?をしているのでしょうか?教えてくださいm(_ _)m
*350 次の不定積分を求めよ。
(1) Sxsin 2xdx (2) fxe²* dx
→ p. 200
(3) Sdx
350 (1) Sxsin 2x dx=x-cos2x) dx
=-xcos2x+cos
2
cos 2x dx
=-1/2 x
xcos2x+sin 2x +C
2x
dx=
dx
X
= 12x₁² -
(2)
xe
e²x dx
1/2/(1
3dx=Sxtan
(3)
2
cos²x
1-1/2 1²₁ ) + C
2z
xe
-dx= x(tanx)dx
=xtanx−| tanxdx
sin x
=xtanx
-S.
-dx
COS X
(cosx)
=xtanx+
+S
-dx
COSX
=xtanx+log|cosx}+C
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そうなんですね。ありがとうございますm(_ _)m