Use basic identities to simplify cost a + sin x cosx. Enclose arguments of functions in parentheses. For example, sin (2x). Remember that writing sin(x) to the fourth power as sin (a) is just a mathematical shorthand. You should write it as (sin (x) )4, which is what Mobius expects. sin (a) On ? cos3 x + sin- x cos x = Show your work and explain, in your own words, how you arrived at your answer. Answers with no relevant explanations may receive reduced or no credit