正在进行安全检测...
发布时间:2023-11-21 21:33:19
20####省高等数学〔微积分〕竞赛试题与参考答案
〔文专类〕
一、计算题〔每小题12分,满分60分〕
11.求极限lim2nn1解lim2nnnisini1ni
nisini111i1111=xsinxdx=xdcosx=(xcosx0cosxdx
0n00=1(111sinx=01
2.计算不定积分xdx
1xx解
44xdx=d1xx=1xxC
331xx3.设f(x(tanx41[(tanx242(tanx1004100],求f(1
解f(x(tanx421[(tanx242(tanx1004100]
f(x4secx4[(tanx242(tanx1004100]
(tanf(1x441[(tanx242(tanx1004100]
4sec2[(12(1100]=299!
xcott4.设cos2t,t(0,,求此曲线的拐点
ysint解
dydxcsctcott2cost,csc2tdtdtd2ydy2cost(12sint,23sin3tcos2t
dxdx1/4
d2y3令20得t1,t2dx44d2y当0t时,20,dx4d2y3当t时,20,dx44d2y3当t时,20,dx4因此拐点为(1,0,(1,0
15.已知极限lim(