2+2=5 to prove

1.	2+2=5 to prove
Answer» Let a=2 b=2 a=b a×a=ab a^a-b^b = ab-b^b(a+b)(a-b)=b(a-b) a+b =b(a-b)/(a-b) 2+2= 2 If A,B and C are interior angles of a triangle ABC,then show that sin (B+C/2)=cos A/2

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