Estimate each quotient 195 divided by 4

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

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