ax + by = 2, bx – ay = 3 এবং x+y =1 হলে a²+b² এর মান-
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Answer:(ax + by)²+ (bx-ay)²= 2²+3²=13
=) a²x²+b²y²+b²x²+a²y²=13
=) x²(a²+b²)+ y²(a²+b²)=13
=) (a²+b²)(x²+y²) = 13
=) (a²+b²) =13 when (x²+y²)=1 ans
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