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x=lnsint,y-e^ysint=1求dy/dx?

题目详情
x=lnsint,y-e^ysint=1求dy/dx?
▼优质解答
答案和解析
x=lnsint,
dx/dt=1/sint*cost=cost/sint
y-e^ysint=1
dy/dt-sint*e^y*dy/dt-cost*e^y=0
dy/dt*(1-sint*e^y)=cost*e^y
dy/dt=cost*e^y/(1-sint*e^y)
所以
dy/dx=(dy/dt)/(dx/dt)=cost*e^y/(1-sint*e^y)/(cost/sint)=sint*e^y/(1-sint*e^y)