if cosx = 0.25 find sinx, tanx

To calculate the value of the function tan x, we'll use
the formula:

(tan x)^2 +  1 = 1/(cos
x)^2

(tan x)^2 = 1/(cos x)^2 -
1

tan x = +/-sqrt [1/(cos x)^2 -
1]

tan x = +/- sqrt (16-1)

tan
x = +/- sqrt15

We'll calculate the value of sin x, using
the formula:

tan x = sin x / cos
x

sin x = tan x * cos x

sin x
= (+/- sqrt15) * (1/4)

The values of tanx and sin x could
be positive or negative, depending on the quadrant where the angle x is
located.