જો $f(x) = kx^3 - 9x^2 + 9x + 3$ દરેક અંતરાલમાં એકવિધ વધતું વિધેય હોય,તો

  • A
    $k < 3$
  • B
    $k \le 3$
  • C
    $k > 3$
  • D
    આમાંથી કોઈ નહીં

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વિધેય $f(x) = \frac{4x^3 - 3x^2}{6} - 2 \sin x + (2x - 1) \cos x$ માટે:

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$y = x^2 e^{-x}$ એ . . . . . . પર વધતું વિધેય છે.

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