Can sombody please help me with this question before times runs out

What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?