(1 point) The graph below shows a sinusoidal function f(t). You may assume that the coordinates of the highest and lowest points on the curve are all integers f(t) +--+--รฃยย -5 18 15 20 If f(t) is given in the form f(t) = a sin(bt + c) + d find a, b, c and d where a and b should be positive. Round your answers to at least 4 decimal places If f(t) is given in the form f(t) = a cos(bt + c) + d find a, b, c and d where a and b should be positive.. Round your answers to at least 4 decimal places