Please simplify sin(6x)•cos(2x) - cos(6x)• sin(2x) A. Cos 4x
B. Cos 8x
C. Sin 8x
D. Sin 4x

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.

Donald has x twenty-dollar bills and 11 ten-dollar bill. how much money does donald have? write your answer as an expression.