tan 3 (x + h) - tan 3x 7. The lim is h-0 h (A) O (B) 3sec (3x) (C) sec (3x) (D) 3cot (3x)
tan 3 (x + h) - tan 3x 7. The lim is h-0 h (A) O (B) 3sec (3x) (C) sec (3x) (D) 3cot (3x) (E) nonexistent 8. If y = 2cos d2 y NIX , then dx2 (A) -8cos NIX (B) -2cos NIX (C) -sin (D) - cos NIX (E) COS NIX N 9. If y = tan x -cotx, then dy = dx (A) sec x csc x (B) secx - csc x (C) sec x + cscx (D) sec x-csc x (E) sec x + csc2 x
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