Can someone help me with this?

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

Consider the functions below. function 1 function 2 function 3 select the statement which is true about the functions over the interval [1, 2] a b function 3 has the highest average rate of change function 2 and function 3 have the same average rate of change. function and function 3 have the same average rate of change function 2 has the lowest average rate of change d.

What are the coordinates of the point that is 1/3 of the way from a to b? a (2,-3) b (2,6)