x এর প্রেক্ষিতে ln(1 + e^x) এর অন্তরজ কোনটি?

If $\displaystyle y= \frac {\sqrt[3]{1+3x}\sqrt[4]{1+4x}\sqrt[5]{1+5x}}{\sqrt[7]{1+7x}\sqrt[8]{1+8x}}$, then $y'(0)$ is equal to

$\frac{d}{d x}\left(9^{x}\right)=$ কত?

Let $f\left ( x \right )=x-1$ and $g\left ( x \right )=\dfrac{1}{2}$. Then the set of points where $g(f(g(x)))$ is continuous is