Mister Exam

cos(x)*cos(x)/sin(x) canonical form

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

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The solution

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   2       
cos (x)    
------- = 0
 sin(x)    
$$\frac{\cos^{2}{\left(x \right)}}{\sin{\left(x \right)}} = 0$$
cos(x)^2/sin(x) = 0