new file:   trigIdentities.pdf
Merge branch 'master' of https://github.com/RandyMcMillan/MAC1147

* 'master' of https://github.com/RandyMcMillan/MAC1147:
  new file:   ArcSine_quads_01_Pengo.svg 	new file:   Arcsine_Arccosine.svg 	new file:   Arctangent_Arccotangent.svg 	new file:   Inverse trigonometric functions - Wikipedia, the free encyclopedia.webloc 	new file:   Using the Graphing Calculator to Work with Inverse Trig Functions.webloc