Mister Exam
r=(2cosx+sinx) canonical form
The teacher will be very surprised to see your correct solution 😉
The solution
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r - sin(x) - 2*cos(x) = 0
$$r - \sin{\left(x \right)} - 2 \cos{\left(x \right)} = 0$$
r - sin(x) - 2*cos(x) = 0