Question 340298
{{{y=5/(2x)^3+2cos(x)
{{{y=(5/8)x^(-3)+2*cos(x)
{{{dy/dx=(5/8)(-3(x)^(-4))-2sin(x)}}}
{{{dy/dx=-(15/8)x^(-4)-2sin(x)}}}
{{{highlight(dy/dx=-15/(8x^4)-2sin(x))}}}