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AonZ
 one year ago
Pls Pls Pls help... I have been stuck for a while!!!
Prove
tan3x = (3tanx  tan^3 x) / ( 1  3tan^2 x)
using sin3x/ cos3x = tan3x
sin3x = 3sinx  4sin^3 x
cos3x = 4cos^3 x  3cosx
AonZ
 one year ago
Pls Pls Pls help... I have been stuck for a while!!! Prove tan3x = (3tanx  tan^3 x) / ( 1  3tan^2 x) using sin3x/ cos3x = tan3x sin3x = 3sinx  4sin^3 x cos3x = 4cos^3 x  3cosx

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.Sam.
 one year ago
Best ResponseYou've already chosen the best response.0Have you tried using\[\tan(3x)=\tan(2x+x)\] Then \[\tan(A+B)=\frac{tanA+tanB}{1tanAtanB}\]

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1the question asked to solve it using tan3x = sin3x / cos3x :/

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1can you pls post it :) May help me solve it :)

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1factor out sin and cos

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1(3sinx  4sin^3 x)/(4cos^3 x  3cosx) (sinx)(34sin^2(x))/((cosx)(4cos^2(x)3)

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1my way was to factor out sin and cos so it was tanx times something then i divided the numerators by cos^2 x then im stuck

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1Pick a trig function, sine or cosine

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1Thanks, loser66

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1so, let's go with sine cos^2(x)=1sin^2(x), right?

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1plug in (1sin^2(x)) for cos^2(x) (sinx)(34sin^2(x))/((cosx)(4cos^2(x)3)

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1yea i actually tried that :P

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1after doing that would you divide by cos^2 x?

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1wait up look at the tan(3x) expression can't you clean that up a bit?

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1possibly... But you could always change it both ways

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1this is the last step i got todw:1369140948450:dw

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.11/cos^2(x) is sec^2(x), right?

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1use the tangentsecant identity

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.11+tan^2(x) = sec^2(x)

trumpetmaster7777
 one year ago
Best ResponseYou've already chosen the best response.1Thank you :D

AonZ
 one year ago
Best ResponseYou've already chosen the best response.1on denominator its still sec^2  4tan^2 ... errr im lost again

RolyPoly
 one year ago
Best ResponseYou've already chosen the best response.0Would that help? sec^2 = 1 + tan^2
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