In the example, arcsec(4)= arccos(0.25)=75.52 degrees.
Buy a good calculator.
if u have a regular calculator, you cannot put y =, if u have a graphing calculator, then you press the "y =" button
Put the number on the top of the fraction in the calculator press the divide button the put the number on the bottom of the fraction in the calculator and press the equal button.
You need a scientific calculator, or one with function keys.
You can use the cables that come with the calculator to get them from friends that already have them.
Ti-83 calculator helps users to set password on their device
by being stupid
urm..... use a calculator
If you put it into a calculator it will give you an a decimal