Question

$please \: solve \: for \: questions \: 13. \: and \: 15. \\ please \: answer \: as \: fast \: as \: possible. \: it \: is \: very \: urgent.$

Answer 1

Answer:

it will be long to type but I will give you a tip for 15

Step-by-step explanation:

take values of x and y and substitute In the give question and prove LHS=RHS.

Answer 2

Take value of that variable except 0 and 1 and prove it.