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Question

limxπ2(π2x)secxcosecx=

A
1
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B
0
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C
-1
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D
1π
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Solution

The correct option is A 1
limxπ2(π2x)secxcscx
=limh0(π2π2+h)sec(π2h)csc(π2h)
=limh0hcschsech
=limh0hcoshsinh=1

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