The graph below shows a function $y=f(x)($solid black$),$ together with a tangent line $($dashed red$)$ to the curve at the point $(0,\frac{3}{2}).$

We don't know the formula for the function $f,$ but we do know its derivative:

We don't know the formula for the function $f,$ but we do know its derivative:

$f^{\text{'}}(x)=-2cos(x)+\frac{3sin(-x)}{x^2+2}-\frac{6xcos(-x)}{(x^2+2{)}^2}$

What is the equation of the tangent line?

Answer: $y=$