দৃশ্যকল্প-I: $y(x+1)(x+2)-x+4$

দৃশ্যকল্প-II: $\mathrm{g}(\mathrm{x})=3 \mathrm{x}^{3}-6 \mathrm{x}^{2}-5 \mathrm{x}+1$

If for all $x, y$ the function f is defined by; $f(x)+f(y)+f(x)\cdot f(y)=1$ and $f(x) > 0$.When $f(x)$ is differentiable $f'(x)=$,

(0, 9) ব্যবধিতে f(x)=x³-18x²+96x ফাংশনের  সর্বোচ্চ মান কত ?  

$f(x)=3 x^{3}-6 x^{2}-5 x+2$

$g(x, y)=x^{2}+y^{2}-4 x-6 y-7$.