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Q.

f:R→(0,π2] , where f(x)=cot−1(x2+x+a) , complete set of values of 'a'  such that f(x)  is onto is

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a

[3/4,∞)

b

[1,∞)

c

[1/2,∞)

d

[1/4,∞)

answer is D.

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Detailed Solution

f:R→(0,π2]; f(x)=cot−1(x2+x+a) f  is onto ⇒ 0
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