Anyone good with this problem! pls help , due in 16.

Match each inequality to the number line that represents its solution

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

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