. Choose each answer that is true for the equation.
f(x)=-2x^2-1/2
The vertex is (-2, 1/2)
The value for y in the vertex is y = -1/2
The value for x in the vertex is x = -2

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