4.2+Basic+Sine,Cosine,+and+Tangent+Equations

Ex. 1- Solving cos(x)=a, where a is 1,0, or -1
 * First, make an inverse cosine to get x by itself. x=cos^-1(a)
 * Then you want to find what the inverse cosine a equals.
 * Once you find what the angle is equal to you need to determine what quadrants cosine is positive. If a would be negative, then you would find which quadrants contain a negative cosine.
 * After you determine the quadrants, you create the neccessary quations. Ex. x=a+360degreesk