Verified answer

You are given a rectangular triangle by

its side lengths.

This is easily checked by confirming

18^2=9^2 (9*sqrt(3))^2

Let's abbreviate:

Opposite=O, Adjacent=A and Hypotenuse=H

Then

sin(theta)=O/H

cos(theta)=A/H

tan(theta)=O/A

csc(theta)=1/sin(theta)=H/O

sec(theta)=1/cos(theta)=H/A

cot(theta)=1/tan(theta)=A/O

Now that you have exact definitions,

you can plug in values to find the results.

Hope it helps.