Question

what is addition theorem​

Answer 1

Step-by-step explanation:

a formula or rule that expresses algebraically a function of the sum of two arguments in terms of the same or related functions of the separate arguments [as sin (x + y) = sin x cos y + sin y cos x]

Answer 2

Answer:

According to addition theorem,

x+x= 2x

-x+x=0

-x+(-x)=-2x