[考古] 北科97年考古
3.PI
∫0 x(sin2x)(cos3x)dx
算很久就不是知道要怎麼解
用分部積分的話,後面那個sin cos 很困擾呀......
4.
Find the shortest distance between the points on the surface xy - z^2 + 4 = 0
and the origin.
這題我完全的看不懂,好像是求某個東西的最短距離
5.
Evaluate ∫∫ (x + 2y)dA ,where R is the triangular with vertices
R
A (0,6), B(3,4) C(6,6)
拜倒,這題連題意都不太懂。虧我還想說有個這麼簡單的,結果看到後面３點我冏了。
拜託大大幫忙了＞＜
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