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QUESTION
How do you prove that tangent is an odd function?
A function is even if:
##f(-x)=f(x)##.
A function is odd if:
##f(-x)=-f(x)##.
In this case: ##y=tan(-x)=sin(-x)/cos(-x)=(-sin(x))/cosx=-sinx/cosx=-tan(x)##,
for the simmetry of sinus and cosinus.
