see the picture below!!

Answer:
tanΘ
Step-by-step explanation:
Using the trigonometric identity
sin²x + cos²x = 1 ← subtract sin²x from both sides
cos²x = 1 - sin²x ( take the square root of both sides )
cos x = [tex]\sqrt{1-sin^2x}[/tex]
Hence
[tex]\frac{sinx}{\sqrt{1-sin^2x} }[/tex] = [tex]\frac{sinx}{cosx}[/tex] = tan x
note for x read Θ