DERIVADAS DE FUNCIONES TRIGONOMÉTRICAS
d ----- [sin x] = cos x dx
d ----- [cos x] = - sin x dx
d ----- [tan x] = sec2 x dx
d ----- [csc x] = - csc x cot x dx
d ----- [sec x] = sec x tan x dx
d ----- [cot x] = - csc2 x dx