Write the expression as the sine, cosine, or tangent of an angle. sin 9x cos x-cos 9x sinx

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

What line represents the relationship between r and s

Sara goes on a slingshot ride in an amusement park. she is strapped into a spherical ball that has a radius 3*10^2 of centimeters. what is the volume of air in the spherical ball? use this formula: volume of a sphere=4/3pi,r^3 , where r is the sphere’s radius.