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If x=ev secu, y=ev tanu find  j(u,vx,y)
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x=evsecu xu=evsecutanu  xv=evsecu  y=evtanu  yu=evsec2u  yv=evtanu J(x,yu,v)=(x,y)(u,v)|xuxv yuyv|=|xuxv\yuyv|=xuyvxvyu =evsecutanu×evtanuevsecu evsec2u  =e2vsecu(tan2usec2u)=e2vsecu j(u,vx,y)=1j(x,yu,v)=1e2vsecu , j(u,vx,y)=e2vcosu

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