MCQ
$\sqrt { - 2} \,\sqrt { - 3} = $
- A$\sqrt 6 $
- ✓$ - \sqrt 6 $
- C$i\sqrt 6 $
- DNone of these
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$f(x + y)\, = \,f(x) - 3xy + f(y).$ If $\mathop {\lim }\limits_{h \to 0} \frac{{f(h)}}{h} = 7$ then value of $f'(x)$ is-