Question

The Intermediate Value Theorem may be used to show that there is at least one solution of the equation

7cos(6 x) + x^2 = sin(6 x) for x[0,pi]
To do this, we define the function

f(x) = 7cos(6x)+x^2-sin(6x)
Enter the coordinates of a point (x, y = f(x)) with a negative y-coordinate ( , ).