If `x^py^q=(x+y)^(p+q)` then the value of `(d^(2)y)/(dx^(2))` is (where `p,q in N` )
(A) 0 (B) -1 (C) 1(D) None of these

If x=(p+q)/(p-q) and y=(p-q)/(p+q) then the value of (x-y)/(x+y) is

If x^(p) y^(q) = (x + y)^((p + q)) " then " (dy)/(dx)= ?

If x^(p) + y^(q) = (x + y)^(p+q) , " then" (dy)/(dx) is

If p>1 and q>1 are such that log(p+q)=log p+log q ,then the value of log(p-1)+log(q-1) is equal to (a)0(b)1 (c) 2(d) none of these

If x^py^q=(x+y)^(p+q) , then dy/dx= (a) x/y (b) y/x (c) x/(x+y) (d) y/(y+x)

If p^(3)-q^(3)=(p-q)((p-q)^(2)-xpq), then find the value of x is (a) 1 (b) -3(c)3(d)-1

If y=f(x),p=(dy)/(dx) and q=(d^(2)y)/(dx^(2)), then what is (d^(2)x)/(dy^(2)) equal to ?

If (x,2p+q)=(y,p+2q) then p-q=_______