Simplify the trigonometric expression sin^2 theta/1+cos theta a. cos theta b.1+cos theta c.1-cos theta d.1-cos theta/cos theta

theta= 1-theta, so you can simplify the top to that. From there, since that is a difference of squares, you can then factor it to (1-cos theta)(1+cos theta), then cancel out (1+cos theta) on the top and bottom of the fraction so that it becomes C, 1-cos theta.

Area of s rectangle = (length) times (width)

(m+9) times (m+2) = m² + 2m + 9m + 18 = m² + 11m + 18