# Math Help - Linear approximation problem

1. ## Linear approximation problem

Hello forumers, this question had been buzzing me for quite some time now.
that is, THE LINEAR APPROXIMATION OF f(x)=tan(2x) at a=0.
If the x value and a linear equation given, probably i can still solve the question. When given in trigonometric from, i am somw how stuck...

$f(x)\approx f(0)+xf'(0)$