DIFFERENTIAL CALCULUS
19. If y = [(1-x)]/x]2, then dy/dx is: a) 2(x-3 + x-2) b) 2(-x-3 + x-2) c) 2(x-3 – x-2) d) none of these . 20. If y = (x + , then dy/dx is equal to . a) ny b)ny/ c)-ny/ d)none of these. 21. If y = then (x2 – 1) (dy/dx)2 – m2y2 is equal to . a) 0 b) 1 c) -1 d) x. 22. If y = then y y1 (where y1 = dy/dx) is equal to . a)-x b)x c)1/x … ................
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