Prove the following (a 2+b 2 ) 2 - 2a 2b 2=a 4+b 4
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1
Answer:
a
4
+2a
2
b
2
+b
4
=(a
2
)
2
+2a
2
b
2
+(b
2
)
2
=(a
2
+b
2
)
2
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