1. The problem statement, all variables and given/known data Verify the linear approximation tanx = x at a=0. Then determine the values of x for which the linear approximation is accurate to within 0.1. 2. Relevant equations L(x)=f(a) + f'(a) (x-a) 3. The attempt at a solution Besides writing down that tanx - 0.1 < x < tanx + 0.1 I have no idea how to approach this!