What is the measurement of the angle FHG

How do you solving the solution of each system using elimination?

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

Y+ 2/y is it a polynomial in one variable or not? and if so, why?