If tan x=o.8 how can i know what is (X) without using a graphing calculator?

Question

If tan x=o.8 how can i know what is (X) without using a graphing calculator?

Answer 1

You have to use the inverse identity.

arctan (tan(x))=x

arctan 'undoes' what tan does to x.

tan x =.8

x=arctan .8

Answer 2

tan x=0.8

tan x =8/10

        =4/5

x= tan inverse of 4/5

Answer 3

Use the arctan function (or tables).

Answer 4

you can rearrange the equation

tan x = 0.8

x = 0.8/tan

although you will still need a calculator lol

Hope this helps