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anonymous
 one year ago
Can someone help me with this:
Find all solutions in the interval [0, 2pi) .
7 tan^3x  21 tan x = 0
anonymous
 one year ago
Can someone help me with this: Find all solutions in the interval [0, 2pi) . 7 tan^3x  21 tan x = 0

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DanJS
 one year ago
Best ResponseYou've already chosen the best response.0try factoring tan(x) out first, so tan(x) = 0, recall identities to replace tan^2 and tan by sin and cos maybe

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0those probs just play around till you get something in terms of sin and cos using identities and algebra

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0\[7\tan(x)[\tan^2(x) 3]=0\] \[7\tan(x)[\frac{ \sin^2(x) }{ \cos^2(x) } 3]=0\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0On the very left its pie.k and not pie

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@DanJS what are you doing ? :s

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I mean very right* on the bottom +pie.k

DanJS
 one year ago
Best ResponseYou've already chosen the best response.0lol idk, you have it right, use the unit circle, tan(x)=y/x, remember symmetries if needed for multiple answers over the domain

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh and since its limited between ]0,2pie[ Then you write my answer and add for k=0,1,2
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