Hi I know this is pretty basic but just want to make sure i understand
tanA= -2/6
Find two possible values for the measure of angle A and the related acute angle.
Thanks!
I you have the form;
tan(x) = k
Where x is an unknown and k is some fixed constant, then...
x = $\displaystyle tan^{-1}(k)$
If you were to just put this in a calculator, you'll only get one answer. However, as you know, there's an infinite amount of answers, so all you do is add/subtract pi to your answer to get the next/previous answer. So really...
x = $\displaystyle tan^{-1}(k) + pi$ or x = $\displaystyle tan^{-1}(k) - pi$
Subtracting from 180° (or $\displaystyle \displaystyle \pi$ radians) works for sine and cosecant, but not for the other trig functions.
On the unit circle, add 180° when solving a tangent or cotangent problem. Subtract from 360° when working with the cosine.
These will give you a 2nd answer on the unit circle.