cos x= sn x x sec 2x-tan 2.x 1. Prove the identity cos.x + sin x Justify your solution. Include the following as needed: Show diagram, Define variables, State formula, theorem, equation or function used, Show substitutions and or steps in solving an equation, State restrictions, State concluding statement, Use correct notation. No marks are given if your solution includes: e or In, differentiation, integration. This is an evaluation, make sure you are completing the work on your own.