曲线积分,曲线y=asin2t x=a(lntant+cos2t),a>0,0
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y=a*sin(2t),dy/dt=2a*cos(2t)
x=a*[lntan(t)+cos(2t)],
dx/dt=a*cot(t)*[sec(t)]^2-2a*sin(2t)=2a*[1/sin(2t)]-2a*sin(2t)=2a*cos(2t)*cot(2t)
dy/dx=(dy/dt)/(dx/dt)=cos(2t)/[cos(2t)*cot(2t)]=tan(2t)
设A(x0,y0),其中y0=a*sin(2t0),x0=a*[lntan(t0)+cos(2t0)],0
x=a*[lntan(t)+cos(2t)],
dx/dt=a*cot(t)*[sec(t)]^2-2a*sin(2t)=2a*[1/sin(2t)]-2a*sin(2t)=2a*cos(2t)*cot(2t)
dy/dx=(dy/dt)/(dx/dt)=cos(2t)/[cos(2t)*cot(2t)]=tan(2t)
设A(x0,y0),其中y0=a*sin(2t0),x0=a*[lntan(t0)+cos(2t0)],0
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