Question 516222
Find all solutions of the equation in the interval (0,2pi). 
tan^2x-6tanx+5=0
So far I have:
(tanx-1)(tanx-5)=0
tanx=1 and tanx=5
so far everything is correct
to finish:
arctan(-1)=3&#960;/4 and 7&#960;/4 radians (In quadrants II and IV where tan<0
arctan(5)=1.3734 and 4.5134 radians (In quadrants I and III where tan>0