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Question: dsolve and event syntax

Question:dsolve and event syntax

panke 145 Maple 13
ode events dsolve numeric differential-equations
July 05 2020
1

I have 2   equations that must be zero, and 2 ODE's for phi and theta

Vector(2, {(1) = `ϕ`(tau)-1.5*sin(`ϑ`(tau)), (2) = -`ϕ`(tau)^2+1.5*cos(`ϑ`(tau))})

how can i implement this quations with event statment .  this dose't work

 

event1 := [[`and`(gln[1], gln[2]), halt]]

 

 
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