Trigonometry

** //a referance angle is the positive acute angle made with the x-axis// //the radian measure of an angle is the ratio of the arc length, s, to the radius, r.// __Degree to Radians:__ __Radians to Degree:__ //Law of Cosines// //Law of Sines// or the inverse sine is only defined when  and when or or
 * __Basic Trigonometry Relationships__
 * __Referance Angle and Unit Circle__**
 * __Radians__**
 * __Identities__**
 * __Law of Sines and Cosines__**
 * __Inverse Trigonometry__**
 * __Cis__**
 * __//e// Raised to an Invisible Power (Euler's Formula)__**