For what value of `k` `f(x)=`

For what values of k, f(x) = x-(k)/(x) has a maximum value at x = -2.

For what values of k , f(x)={:{((1-coskx)/(xsinx)," if " x ne 0),(1/2," if " x =0):} is continuous at x = 0 ?

Let f(x)={x^(2),x 0} ,then for what value of (k,p),f(x) has a minimum

f(x)=x^(2)+16 . For what value of k is f(2k+1)=2f(k)+1 if k is a positive integer?

For what value of k, the function f(x) = kx^3 +5 is decreasing?

For what value of k, then function f(x) = k(x + sin x) + k is increasing ?

For what value of k, the function f(x)=k(x +sin x)+ k is increasing?

For what value of k is the function f(x)={k(|x|)/(x),x =0 continuous at x=0?

For what value of k is the function f(x) = { k|x|/x, x =0 continuous at x = 0 ?

For what value of k, the function f(x)={kx^(2),quad if x<=2 and 3,quad if x<2 is continuous?