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Math·Geometry and Trigonometry·Right triangles and trigonometry

easy

If $x$ is the degree measure of an angle between $0^{\circ }$ and $90^{\circ }$, and if $\cos x^{\circ }=\frac{4}{5}$, what is the value of $\tan x^{\circ }$?

A

$\frac{5}{4}$

B

$\frac{3}{4}$

C

$\frac{4}{3}$

D

$\frac{3}{5}$