This week’s lesson was about 8-1. So far this year, this is the easiest thing we have learned in my opinion. Basically, it is finding the inverse of an angle and adding or subtracting numbers. When solving the problem, you have to follow the trigonometry function’s value. (For example: sin=y, cos=x.) There are simple ways to find which quadrant your answers are in.
STEPS:
1. Take the inverse of the positive number to find the Quadrant I angle.
To get to:
QII: Make the angle negative and add 180°
QIII: Add 180°
QIV: Make the angle negative and add 360°
Example Problem:
3cosΘ+9=73cosΘ=-2cosΘ=-2/3Θ=cos^-1(-2)Θ=48.190°
Since cosine is dealing with x, we need to find where x is positive, which is in Quadrants I & IV
To find quadrant IV’s answer, make the angle negative and add 360°
-48.190° + 360° = 288.190°
Quadrant 1= 48.190° & Quadrant 4=288.190°
Overall, this was an easy concept to understand.
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