MCQ
Which of the following rules is not a function from $R$ to $R$ ?
- A$f(x)=x^2$
- ✓$f(x)=\sqrt{x}$
- C$f(x)=x^{1 / 3}$
- D$f(x)=x^3$
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If $\text{f}(\text{x})=\sqrt{\text{x}}+\frac{1}{\sqrt{\text{x}}}$ then $\frac{\text{dy}}{\text{dx}}$ at x = 1 is equal to:
$1$
$\frac{1}{2}$
$\frac{1}{\sqrt{2}}$
$0$
The value of $\tan3\text{A}-\tan2\text{A}-\tan\text{A}$ is equal to:
$\tan3\text{A}\tan2\text{A}\tan\text{A}$
$-\tan3\text{A}\tan2\text{A}\tan\text{A}$
$\tan\text{A}\tan2\text{A}-\tan2\text{A}\tan3\text{A}\tan\text{A}$
$\text{None of these}$