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Using identity (a+b) ^2 =a^2 +b^2 +2×a ×b
3/5a^2 +2/3b^2 +2×3/5×2/3
=9/25a^2 +4/9^2+4/5
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3/5a^2 +2/3b^2 +2×3/5×2/3
=9/25a^2 +4/9^2+4/5
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