If A+B+C=180 then prove that

Cos3Acos3B+cos3Bcos3C+cos3Ccos3A=1

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

Is there an x intercept in the equation 60*1.15^x

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle