How to solve this problem i️ need i️ am very confused

Is this a polynomial function? i need to know asap

What value is a discontinuity of x squared plus 8 x plus 4, all over x squared minus x minus 6?

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