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Construct sinusoidal functions


The graph of a sinusoidal function intersects its midline at left parenthesis, 0, comma, 1, right parenthesis and then has a maximum point at left parenthesis, start fraction, 7, pi, divided by, 4, end fraction, comma, 5, right parenthesis.
Write the formula of the function, where x is entered in radians.
f, left parenthesis, x, right parenthesis, equals