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फलन y = f(x) का ग्राफ रेखा x = 2 के सममित हो, तब

(A) f(x) = f(-x)

(B) f(2 + x) = f(2 - x)

(C) f(x + 2) = f(x - 2)

(D) f(x) = -f(-x)

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सही विकल्प है (B) f(2 + x) = f(2 - x)

यदि कोई फलन h(x) y-अक्ष (i.e. x = 0) के बारे में सममित है, तो हम लिख सकते हैं:

h(x) = h(−x)

इसे इस प्रकार भी लिखा जा सकता है:

h(0 + x) = h(0 − x)

∴ एक फलन f(x) जो x = 2 के बारे में सममित है, को इस प्रकार लिखा जा सकता है:

f(2 + x) = f(2 − x)

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