Que sucede al estudiar el comportamiento del coseno (en triángulos no rectángulos) de la misma forma que estudamos el seno?

Can someone me i’m confused. will give brainliest and a whole bunch of points

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.

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300