Q.

The minimum value of 27secx+64cosecx forx∈(0,π2) is___and is obtained at­­____

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a

25,tan−143

b

125,tan−1(43)

c

125,tan−1(34)

d

25,tan−1(34)

answer is B.

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Detailed Solution

Minimum value=(a23+b23)32=(9+16)32  , where a=27,b=64                           =125minimum at x=tan−1ba3=tan−1(43)
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