Differentiate each of the following w.r.t. x:
tan3x
Formulae :
•
Let,
y = tan3 x
and u = tan x
therefore, y= u3
Differentiating above equation w.r.t. x,
………… By chain rule
………….
= 3 tan2 x .(sec2 x)
= 3 tan2 x . sec2 x