Let f(x) be a continuous and not a constant function of all x in its domain, such that (f(x))2=x∫0f(t)4sin2t−4sin2t+4dt and f(0)=0, then
If f(x)=0 is a quadratic equation such that f(−π)=f(π)=0 and f(π2)=−3π24, then limx→−πf(x)sin(sinx) is