What is the value of i^20+1?
a. 1
b. –1
c. –i
d. i

ANSWER

EXPLANATION

The given expression is;

Recall that, in complex numbers

We use this identity to simplify the given expression:

This implies that:

for this pair of functions g(x)=x-2 and f(x)=|x| is (g o f)(a)= |a| -2

step-by-step explanation:

g(x)=x-2

f(x)=|x|

(g o f)(a)=?

(g o f)(x)=g(f(x))

(g o f)(x)=g(|x|)

(g o f)(x)=|x|-2

(g o f)(a)=|a|-2

a

step-by-step explanation: