I really dont know where to post this but i just want to find how to get this:

given: x=1

f(x)=2x-tanx

the answer is supposed to be 0.443.

Now my problem is how did he get 0.433 because i keep doing 2(1)-tan(1) and im getting 1.982544935 HELP IM NOT GOOD AT MATH(Crying)