Question 1205885
i believe selection D.


cotan(0) = 1/tan(0) = undefined, so selection A and C are no good.


cosin(0) = 1, so selection B and E and F are no good.


selection D is the only one where all the functions mentioned in it are 0 when x is 0.


that is only the tan function and the sin function.


listing all the functions at x = 0 gets you.


sin(0) = 0 *****
cos(0) = 1
tan(0) = sin(0)/cos(0) = 0/1 = 0 *****
cot(0) = 1/tan(0) = undefined
sec(0) = 1/cos(0) = 1/1 = 1
csc(0) = 1/sin(0) = 1/0 = undefined