Question

Show that i +i^15 +i^7 + i^19 is a real number.​

Answer 1

Step-by-step explanation:

i+(i^12)(i^3)+(i^4)(i^3)+(i^16)(i^3)

if the power of i is integral multiple of 4 then its value is 1

i+i³+i³+i³

i+3i³

i+(-3i)=-2i

not a real number

i³=-i