Write the English phrase as an algebraic expression. Then, simplify the expression. Let x represent the number, The difference between the product of three and a number and two times the number.

What is the algebraic expression?

(Do not simplify.)

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