Question:যদি `a = x^2 + z^2, b = y^2 + z^2, c = x^2 + y^2` হয়, তবে দেখাও যে, `a + b - c = 2z^2` 

Answer দেওয়া আছে `a + b - c = 2z^2` এবং = a + b + c `= (x^2 + z^2) + (y^2 + z^2) - (x^2 + y^2)` [a, b,ও c এর মান বসিয়ে] `= x^2 + z^2 + y^2 + z^2 - x^2 - y^` `= z^2 + z^2 = 2z^2` = ডানপক্ষ `:. a + b - c = 2z^2` 

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jodi `a = x^2 + z^2, b = y^2 + z^2, c = x^2 + y^2` hoyo, tobe dekhao je, `a + b - c = 2z^2`
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