Trig Proof Help - Physics Forums: Physics, Astronomy, Math, & Philosophy Forums!

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#1
10-04-2006, 12:09 AM
 bdub91284 Junior Member Join Date: Oct 2006 Posts: 1
Trig Proof Help

Need to prove...

[sinx]/[(cosx)^2-(sinx)^2] = [tanx]/[1-(tanx)^2]

I'm assuming the only identities you might need are...

(sinx)^2+(cosx)^2=1
tanx=sinx/cosx
and maybe 1+(tanx)^2=(secx)^2 where secx=1/cosx

Help,
Brandon
#2
10-04-2006, 02:18 AM
 jado818 Junior Member Join Date: Oct 2006 Posts: 18
check equation

I plugged that equation into my graphing calculator and it doesn't look like they equal each other.

Im using a TI-89 calculator in radians mode.

maybe you got a sign switched around somewhere man...

Jack

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