8-5

In Advanced Math this week, we learned and reviewed sections of Chapter 8. In 8.5 we learned how to use identities to get to be the same. Trig function= if you can’t try to make it tan or cot by sin/cos or cos/sin.

When you are working in 8.5 you will have to follow the inverse rules.

There are things you can’t do in 8.5 and if u do them you will get the problem wrong.
The things you can’t do are:
-Divide by a trig function when solving to cancel.
-Cancel from the inside of a trig function. (Examples sin (2x)/2=you can’t cancel the 2 and the other one is sin^2x=sinx=you can’t divide and cancel.)

Example: 2sin^2theta-1=0
- 1 trig function and has 1 term.
- You move the 1 over.
- You get 2sin^2theta=1.
- Divide the 2 before sin by each side.
- You get sin^2theta=1/2.
- Square both sides.
- Sin theta= + and – square root ½.
- Do sin inverse square root ½.
- You get 45.
- Find Q2, Q3, Q4.
- Q2 you do 180-45=135. Q3 you do 180+45=225. Q4 you do 360-45= 315.
- Your answer is: theta= 45 degrees, 135 degrees, 225 degrees, 315 degrees.

By looking at 8.5 if you know the rules and everything else. It is really easy but just takes time and effort.