bhaiya please bata do na aise kaise karenge question ko
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Here ×× is a cross product.(ALL QUANTITIES HERE ARE VECTORS)
(A+B)×(A−B)(A+B)×(A−B)
=(A×A+B×A−A×B−B×B(A×A+B×A−A×B−B×B
Now
A×A=0 A×A=0 and B×B=0 B×B=0 and A×B=−B×A A×B=−B×A
so we get (A+B)×(A−B)(A+B)×(A−B) =B×A→−A×BB×A−A×B=2(B×A)
(A+B)×(A−B)(A+B)×(A−B)
=(A×A+B×A−A×B−B×B(A×A+B×A−A×B−B×B
Now
A×A=0 A×A=0 and B×B=0 B×B=0 and A×B=−B×A A×B=−B×A
so we get (A+B)×(A−B)(A+B)×(A−B) =B×A→−A×BB×A−A×B=2(B×A)
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