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dy 21. If y = ln (x2 + y2), then at the point (1,0) = (A) 1 (B)0 (C)2 (D) e/2 (E) none of (A) to (D)
25. If y(2) = x", then y'(x) = (A) x2–1 (B) 222-1 (C) xv7–! In x D x*(1 + Inx) (E) none of (A) to (D)
Wu 21. If cos (xy) = 1 - sin y, then at the point (1, 7/2) = dc (A)1 (B)-1 (C)/2 (D) -1/2 (E) none of (A) to (D)