derivative rules

y = c

y' = 0

y = ax

y' = a

y = x^n

y' = nx^n-1

y = sinx

y' = cosx

y = cosx

y' = -sinx

y = tanx

y' = sec^2x

y = secx

y' = secxtanx

y = cscx

y' = -cscxcotx

y = cotx

y' = -csc^2x

y = [ln u]

y' = u'/u