The function `f(x)=(1-cos ax)/(1-cos bx)"for "x ne 0, f(0)=a/b" at x= 0 is "`

The function f(x)=(1-cos x)/(x^(2))" for "x ne 0, f(0)=1" at x=0 is"

if the function f(x) ={ (1- cos2x)/( 1- cos x) ,x ne 0 is k for x =0 is continuous at x=0 then the the value of k is

if f(x)=(1-cos ax)/(x sin x)" for "x ne 0, f(0)=1//2 is continuous at x=0 then a=

If f(x)=x cos""1/x^(2)" for "x ne 0, f(0)=1" then at x=0, f(x) is"

If the function f(x) = {(1-cos x)/(x^(2)) for x ne 0 is k for x = 0 continuous at x = 0, then the value of k is

Examine the continuity of the function f(x)= {((1-cos(2x))/(x^(2)),"if "x ne 0),(5",","if" x = 0):} at x=0