B don’t quote me if I’m wrong
Every point in the unit circle is identified either by its coordinates
or by the angle it forms with the x-axis,
.
The trigonometric functions associate with every angle
and the correspondant
coordinates the two values

This procedure can be done for every angle
, so you don't have to work with acute angles only.
90+85=175
Thats the answer
X2 - 2x + 9x - 18
X2 + 7x - 18