Mathc initiation/a0077
Apparence
Calculons la dérivé :
y = sec(x)
y = 1/cos(x)
y'= ( 1/cos(x) )'
y'= -(-sin(x))
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cos(x)**2
y'= sin(x) 1
------ ------
cos(x) cos(x)
y'= tan(x) sec(x)