Help me god please it was due yesterday

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

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points