Simplify for 2pts. cos1º + cos2º +cos178º + cos179º

Someone answer this asap for the length, in feet, of a rectangular rug is represented by the expression 5x² + 2x. the width, in feet, is represented by the expression 3x². which expression represents the perimeter, in feet, of the rug? a. 8x² + 2x b. 8x² + 4x c. 16x² + 2x d. 16x² + 4x

32a³b² 8ab² simplify the following expression.

Which angle is the smallest? also give me an explanation so i can complete it to other questions as well, : )