2: 4: 6 angle measures of a triangle

What basic trigonometric identity would you use to verify that csc x sec x cot x = csc^(2)x

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0