What 3 numbers multiply to get 63?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Complete the steps, which describe how to find the area of the shaded portion of the circle. find the area of the sector by multiplying the area of the circle by the ratio of the to 360. subtract the area of the triangle from the area of the sector.

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!