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Trigonometric identites

Forums: Science And Math
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tm2121
 
Reply Mon 28 Feb, 2005 09:13 am
can somebody please help me prove that:
tan^3x+sinxsecx-sinxcosx
------------------------------- = tanxsecx+sinx
secx-cosx
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raprap
 
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Reply Mon 28 Feb, 2005 09:36 am
You need to know three relationships

tan(x)=sin(x)/cos(x)
sec(x)=1/cos(x)
and
sin^2(x)+cos^2(x)=1

The rest is substitution and elimination

Rap
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mathman
 
  1  
Reply Mon 7 Mar, 2005 05:02 pm
Hello
Convert everything to sine and cosine. Trig identities are easy to play with in this fashion.

Guido
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