Help!! i don’t understand how to do the questions that i put in the picture

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

Which statement about the relative areas of ? abc and ? xyz is true? the area of ? abc > the area of ? xyz the area of ? abc < the area of ? xyz the area of ? abc = the area of ? xyz more information is needed to compare.

What is the point-slope equation of a line with slope -5 that contains the point (6,3)