What is the period of #y=cos x#? Precalculus Graphs of Trigonometric Functions Graphing Sine and Cosine 1 Answer AJ Speller Oct 6, 2014 The period of #y=cos (x)# is #2pi# #period=omega=(2pi)/B#, where #B# is the coefficient of the #x# term. #period=omega=(2pi)/1=2pi# Answer link Related questions What is the y-intercept of the graph of #y = sin x#? What is the graph of #y=sin (x/3)#? What is the graph of #y=sin(x+30)#? What is the graph of #y=sin(x-pi/4)#? What is the graph of #y=sin(x/2)#? What is the amplitude of the graph of #y = sin x#? What is the range of the graph of #y = sin x#? What are the x-intercepts of the graph of #y = cos x#? What is the domain of the graph of #y = cos x#? What is the maximum value that the graph of #y=cos x# assumes? See all questions in Graphing Sine and Cosine Impact of this question 13093 views around the world You can reuse this answer Creative Commons License