The value of cos 4x from the given identity is 0.999
Given the cosine identity
cos8x = 13/36
Determine the value of x
8x = arccos(13/36)8x = 0.36111
x = 0.36111/8x = 0.04514
Determine the value of cos4x
cos4x = cos4(0.04514)
cos4(0.04514) = 0.999
Hence the value of cos 4x from the given identity is 0.999
Learn more trig identity here; brainly.com/question/7331447
Answer:
A or C
Step-by-step explanation:
