Reasoning Determine whether the following relation represents a function. Use pencil and paper. Explain your reasoning.
{(-5,5). (-3,8), (-2,7), (-8,3), (- 9,9), (-7,6)}
Does the relation represent a function?
Yes
No

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