Is the trig function: even, odd, neither #y=cosx#? Trigonometry Graphing Trigonometric Functions General Sinusoidal Graphs 1 Answer Trevor Ryan. Oct 13, 2015 It is even since #cos(-x)=cosx AA x in RR# Explanation: By definition, #f# is an odd function if #f(-x)=-f(x)# #f# is an even function if #f(-x)=f(x)# Since #cos(-x) = cosx# for all #x in RR#, it implies that #f(x)=cosx# is an even function. Answer link Related questions What does sinusoidal mean? Given any sinusoidal equation, how do you identify the type of transformations that are made? How do you graph any sinusoidal graph? What does the coefficients A, B, C, and D to the graph #y=D \pm A \cos(B(x \pm C))#? What is the period, amplitude, and frequency for the graph #f(x) = 1 + 2 \sin(2(x + \pi))#? What is the period, amplitude, and frequency for #f(x)=3+3 cos (\frac{1}{2}(x-frac{\pi}{2}))#? How do you graph #y=2+3 \sin(2(x-1))#? How do you graph #y=2 cos(-x)+3#? How do you graph #y=3cos(4x)#? How do you graph #y=(cos2x)/2#? See all questions in General Sinusoidal Graphs Impact of this question 4612 views around the world You can reuse this answer Creative Commons License