The function intersects its midline at (\pi,-4)(π,−4)left parenthesis, pi, comma, minus, 4, right parenthesis and has a minimum point at \left(\dfrac{\pi}{4},-5.5\right)( 4 π ,−5.5)left parenthesis, start fraction, pi, divided by, 4, end fraction, comma, minus, 5, point, 5, right parenthesis. find a formula for f(x)f(x)f, left parenthesis, x, right parenthesis. give an exact expression. \qquad f(x)=