If tanx = 3/4 ,what is cosx?

[math_celebrity]

If tanx = 3/4 ,what is cosx?

tan(x) = sin(x)/cos(x), so we have:
sin(x)/cos(x) = 3/4

cross multiply:
4sin(x) = 3cos(x)

Divide each side by 3 to isolate cos(x):
cos(x) = 4sin(x)/3