Question

f(x)=x-tg(-2x)= Плизз помогите с производными

Answer 1

$f(x) =x - \tan( - 2x) \\ f(0) = 0 - \tan( - 2 \times 0) \\ f(0) = - \tan(0 ) \\ f(0) = - 0 \\ f(0) = 0$