trigo.py

Created on May 25, 2021

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etudier la parité 

une fonction f est paire si:
  f(-x)=f(x)
une fonction f est impaire si:
f(-x)=-f(x)


cos(-x)=cos(x)
sin(-x)=-sin(x)

periodicité 
f est periodique de periode a si
f(x+a)=f(x)


f'=0 et x=0 cest tangente pour representation
graphique important !

pour resoudre equation

ex cos^2x=1/2

cos x=racine1/2=racine 2/2
et cos x=-racine 1/2=-racine 2/2

derivée 

(cos(x))'=-sin x (sin(x))'=cos x

derivée composée (sin u)'=u'cos(u)
(cos u)'=-u'sin u
pour etudier variation faut derivée

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