Mister Exam

z=arctg(y/x) canonical form

The teacher will be very surprised to see your correct solution 😉

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x: [, ]
y: [, ]
z: [, ]

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The solution

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        /y\    
z - atan|-| = 0
        \x/    
zatan(yx)=0z - \operatorname{atan}{\left(\frac{y}{x} \right)} = 0
z - atan(y/x) = 0