Functii pare
f(x)=f(-x)
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f:R→R f(x)=x² f(x)=f(-x)=x²
cos :R→R cosx =cos (-x)
f:R→R+ f(x) =l xl
f(-x)= l-xl=l xl=x
f:R→R f(x)=x^2n n∈N
f(x)=f(-x)=x^2n
f:R/{(2k+1)π/2}→R* f(x)=1/cosx
f(-x)=1/cos(-x)=1/cosx
Functii impare
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f(-x)= -f(x)
1.f:R→R f(x)=x f(-x)=-x =-f(x)
2,f:R→R f(x)=sinx f(-x) sin(-x)=-sinx
3, f:R→R f(x)=x³ f(-x)=(-x)³=-x³=-f(x)
4,f:R/{(2k+1)π/2}→R f(x)=tgx f(-x)=tg(-x)=-tgx
5f:R/{kπ}→R f(x)=ctg x ctg (-x)=-ctg x)
