The graph of a sinusoidal function intersects its midline at (0,1)(0,1)left parenthesis, 0, comma, 1, right parenthesis and then has a maximum point at \left(\dfrac{7\pi}{4},5\right)( 4
7π

,5)left parenthesis, start fraction, 7, pi, divided by, 4, end fraction, comma, 5, right parenthesis.
Write the formula of the function, where xxx is entered in radians