Which value of $\pi$ shall I plug in this formula $\sqrt{x} + 3 \tan x$ if $x \in [0, \frac{\pi}{4}]$?

Question

Which value of $\pi$ shall I plug in in this formula $\sqrt{x} + 3 \tan x$ if $x \in [0, \frac{\pi}{4}]$?

I used the calculator to calculate it using the $\pi$ in the calculator, but it gives me a different answer than if a plug in in the first $x$ the value of $\pi = 3.14$ and in the second $x$ the value of 180 degree. could anyone show me the mistake in the second method? and tell me what is the correct way of plugging the $\pi$ symbol?

Answer 1

I suspect your problem is following: Many calculators let you choose whether you want to use radians or degrees for specifying angles. (Usually denoted by a rad or deg symbol somewhere on the display.)