Which graph is defined by the function given below ? y=(x-3)(x-3)

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Me i’m stuck on all these questions besides the two bottom ones

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.