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यदि f(x) = x^(2) -4x +6, तो f(1), f(-1),...

यदि `f(x) = x^(2) -4x +6`, तो `f(1), f(-1), f((1)/(2)), f(2 + h)` और `((f(2 + h) -f(2))/(h))` ज्ञात कीजिए।

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