First you should know there is not only one inverse to the cosine, it's not injectiv.
That said you are probably looking for arcuscosine, short acos in the calculator, the one most commenly used. Pressed the '2nd' button in the top left, and the 'acos' button which should now appear there cos was before
First you should know there is not only one inverse to the cosine, it's not injectiv.
That said you are probably looking for arcuscosine, short acos in the calculator, the one most commenly used. Pressed the '2nd' button in the top left, and the 'acos' button which should now appear there cos was before
