Question

prove the following questions​

Answer 1

Step-by-step explanation:

a+ib×c-id +a-ib×c+id/(c+id)(c-id)

ac-aid+ibc-i^2bd +ac+iad-ibc-i^2bd/c^2-i^2d^2

as i^2=-1

and by cancellation we have

ac +2bd +2bd/c^2+d^2

ac+4bd/c^2+d^2 which is also real