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नीचे दिए गए प्रश्न के लिए अनुच्छेद

Consider that f:AB

(i) If f(x) is one-one then f(x1) = f(x2) ⇔ x1 = x2 or f ′(x) > 0 or f ′(x) < 0.
(ii) If f(x) is onto then range of f(x) is B.

Choose the correct answer.

f:AB पर विचार कीजिए।

(i) यदि f(x) एकैकी है तब f(x1) = f(x2) ⇔ x1 = x2 या f ′(x) > 0 या f ′(x) < 0
(ii) यदि f(x) आच्छादक है तब f(x) का परिसर B है।

सही उत्तर का चयन कीजिए।

Q. Which of the following is not a one-one function?

प्रश्न - निम्नलिखित में से कौनसा विकल्प एकैकी फलन नहीं है?

A
f : RR, f(x) = ex
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B
f : R+R, f(x) = lnx
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C
f : RR, f(x) = x3
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D
f : RR, f(x) = x4 + 2x2 + 1
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Solution

The correct option is D f : RR, f(x) = x4 + 2x2 + 1
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