Mister Exam

p=9/(4-cos(a)) canonical form

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

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        9         
p - ---------- = 0
    4 - cos(a)    
$$p - \frac{9}{4 - \cos{\left(a \right)}} = 0$$
p - 9/(4 - cos(a)) = 0