Question

How do you find the arctan 4/3 ? (Without a calculator)

Answer 1

and without drawing the triangle.

Answer 2

you cannot

Answer 3

do it the way we used to have to: look it up in a table of tangents in a book
or use a computer
but satellite is right, it is not one of those easy ones

Answer 4

we can find it. by use of derivative.