What is the difference between cos and cos-1, and how do I use the latter on a scientific calculator?
+23254 If you ask for a cos, the calculator will give you a value in the range from -1 up through +1.
For example, cos(45°) = 0.7071.
If you ask for invCos, your will be entering a number in the range from -1 up through +1, and it will give you the size of the angle that has that value for a cosine. invCos = cos-1
For example, invCos(0.7071) = 45°.
To use on a calculator, depending upon the calculator, press either the (2nd) key or the (inv) key, then cos, then enter the value.
+23254 If you ask for a cos, the calculator will give you a value in the range from -1 up through +1.
For example, cos(45°) = 0.7071.
If you ask for invCos, your will be entering a number in the range from -1 up through +1, and it will give you the size of the angle that has that value for a cosine. invCos = cos-1
For example, invCos(0.7071) = 45°.
To use on a calculator, depending upon the calculator, press either the (2nd) key or the (inv) key, then cos, then enter the value.
