The most important thing to remember when presented with weird things that you have to find the sin/cos/tan etc. for is that YOU NEED TO RELATE IT BACK TO THE UNIT CIRCLE.
For example: if you need to find sin(22.5) think about how you can get it to the familiar numbers on the unit circle.
22.5x2=45 so you can use a half angle formula and solve for sin(45/2)
If you want to review the unit circle click the unit circle link in the sidebar.
For example: if you need to find sin(22.5) think about how you can get it to the familiar numbers on the unit circle.
22.5x2=45 so you can use a half angle formula and solve for sin(45/2)
If you want to review the unit circle click the unit circle link in the sidebar.