If y = sin(x) , y' = cos(x)
If y = cos(x) , y' = - sin(x)
If y = tan(x) , y' = sec
2
(x)
If y = csc(x) , y' = - csc(x) * cot(x)
If y = sec(x) , y' = sec(x) * tan(x)
If y = cot(x) , y' = - csc
2
(x)