# Trig EquationWatch

#1
5 sin2x = 4 cos2x

okay so I know sinx/cosx = tanx is involved but what next?

Thanks for the help
0
12 years ago
#2
5sin2x = 4cos2x
Divide by cos2x
5tan2x = 4
tan2x = 4/5
Solve in double whatever range you have been given to get 2x, and I expect you can figure out the rest.
0
#3
(Original post by Libertine)
5sin2x = 4cos2x
Divide by cos2x
5tan2x = 4
tan2x = 4/5
Solve in double whatever range you have been given to get 2x, and I expect you can figure out the rest.
Wow! Thank you. what a great part of the forum, its almost midnight and I get an answer pretty much instantly !!
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