এর বিস্তৃতিতে x বর্জিত পদ ---- 

$g(x)=4 x, P(y)=\frac{(1+y)^{n}}{1-y}$

$z=2 x+3 y$

$f\left(x\right)=\left(2-\frac{3}{x}\right)^{15}$

The constant term in the expansion of $(x^{2}-\frac{1}{x^{2}})^{16}$ is