math

If 0 = x^2 + sinx, then it means that the expression x^2 + sinx has a result of 0. This means that the polynomial x^2 and the sinusoidal graph of sinx are equal to each other at this particular value of x. Since sinx is periodic and x^2 is not, this can only occur when the value of x is 0. Therefore, 0=x^2 + sinx is true for the value of x equal to 0.