Help me its due in 13 mins i forgot about it ​

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

1. a right triangle is graphed on a coordinate plane. find the length of the hypotenuse. round your answer to the nearest tenth. 2. use the angle relationship in the figure below to solve for the value of x. assume that lines a and b are parallel and line c is a transversal.

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length