Question

find the value of a and b (1+i) (1-i)-¹​

Answer 1

(1+i)(1+i

2

)(1+i

3

)(1+i

4

)

we know i

2

=−1

i

3

=−i

and i

4

=1

then

(1+i)(1−1)(1−i)(1+1)

⇒(1+i)(0)(1−i)(2)

=0