Complete this equation Sin(x+y)/sin(x-y)

Restrictions on f(x) = 1/x+5 and g(x) = x-2

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.