[理工] [工數]-投影
1.
Find an orthogonal basis for the subspace W={[a,b,c,d]|a=b+2c,d=-b+c}
of R^4, that contains the vector[1,1,0,-1].
and find the projection of vector b=[1,0,2,2] on W
2.
f(x)= {e^x x>0,
0 x<0
我算出
1
F[f(x)] = -------
iω+1
請問如何由這個結果算出
∞ cos(βx)+xsin(βx)
∫ ------------------ dx 呢?
0 1+x^2
我用留數求出來是2π(cosβx-sinβx)
麻煩大家幫我看看><
謝謝
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◆ From: 114.41.85.60
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03/10 21:56, , 1F
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1-iw
有..有理化後是------ 還是看不出什麼@@...
1+w^2
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算出來是
iβx -iβx
e (1-ix)+ e (1+ix)
---------------------
2(1+x^2)
接下來該怎麼辦...
※ 編輯: cccoco 來自: 125.230.127.182 (03/10 22:08)
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