If `P+Q+R=180^@` then the value of `psin(Q-R)+qsin(R-P)+rsin(P-Q)`

If a,b,c denote the sides of triangleABC , show that the value of the expression, a^3 (p-q)(p-r)+b^2(q-r)+b^2(q-r)(q-p)+c^2(r-p)(r-q) cannot be negative where p,q,r in R .

If p,q,r be three distinct real numbers, then the value of (p+q)(q+r)(r+p), is

If p,q,r be three distinct real numbers, then the value of (p+q)(q+r)(r+p), is

Add: p(p-q),q(q-r) and r(r-p)

Add : p(p-q),q(q-r) and (r-p)

If p^(q')=512 find the minimum possible value of (p) (q) (r) , where p, q, r are positive integers.