Answer: i think it's either a or d
I don’t exactly know what you’re asking, but cotangent = cosine/sine or another way of writing it is sine = cosine/cotangent
As you can see there are two triangles but it can be done calculating just for one. First we must understand how formula for area of triangle works.
Where represents base (hypotenuse) and as height of the triangle.
We know that:
Using this data we fill the formula.
Hope this helps.
r3t40