The equation having null set as its solution set is

A) x = cos x
B) x = e^x
C) x = sin x
D) x = tan x

  B) x = e^x

Step-by-step explanation:

The graphs of y = e^x and y = x never intersect, so the solution set will be the empty (null) set for ...

  x = e^x

_____

There is one intersection of y=x with cos(x) and with sin(x). There are an infinite number of solutions for x = tan(x).

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation:

1010: 3030

is it i think