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যদি f(x) =

x^{2}

হয়, f(a + b) + f(a – b) এর মান কত?

a^{2} + b^{2}

a^{2} - b^{2}

2 a^{2} + 2 b^{2}

2 a^{2} - 2 b^{2}

ANS : 3

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