Suppose m is an integer . If 4 divides m2 − 1, then m is odd ?. can you prove this in direct proof plz

Suppose m is an integer . If 4 divides m2 − 1, then m is odd ?. can you prove this in direct proof plz

Soo need to know the steps in making this question work out . plz can any one help

Logic phil 60

Phil 60 class

(p<--->q = ~(p and~ q) or ~(q and ~p)

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PLEASE HELP

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