Question 861726
Find all values of t in the interval [0, 2π] satisfying the given equation 
4 sin 2t + 2 tan 2t = 0
divide by 2
2sin2t+tan2t=0
2sin2t+sin2t/cos2t=0
sin2t(2+(1/cos2t))=0
..
sin2t=0
2t=0
t=0
or
2+(1/cos2t)=0
1/cos2t=-2
cos2t=-1/2
2t=2&#960;/3, 4&#960;/3 (In Q2 and Q3 in which cos<0)
t=&#960;/3, 2&#960;/3