$\mathop {\lim }\limits_{h \to 0} \frac{{{{(a + h)}^2}\sin (a + h) - {a^2}\sin a}}{h} = $

  • A
    $a\cos a + {a^2}\sin a$
  • B
    $a\sin a + {a^2}\cos a$
  • C
    $2a\sin a + {a^2}\cos a$
  • D
    $2a\cos a + {a^2}\sin a$

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$\mathop {\lim }\limits_{h \to 0} \frac{{\sqrt {x + h} - \sqrt x }}{h} = $

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