Processing Math: Done

From Förberedande kurs i matematik 1

First, we observe from the unit circle that the equation has two solutions for 03x360,

3x=15and3x=180−15=165.

This means that all of the equation's solutions are

3x=15+n360and3x=165+n360

for all integers n, i.e.

x=5+n120andx=55+n120.