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please can someone solve this and tell me how at the end, it's gives -2 alpha beta instead of +2 alpha beta
I need answers ASAP pleeeeaase!!!!!
![Please Can Someone Solve This And Tell Me How At The End Its Gives 2 Alpha Beta Instead Of 2 Alpha BetaI Need Answers ASAP Pleeeeaase class=](https://us-static.z-dn.net/files/d1b/69811b448614abe5126899f1c1a98c82.jpg)