Pls help me i dont know what to do

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

Describe the domain and range of y=2(3)^x-2+5

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126