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Question

limx0tan([π2]x2)tan(π2)x2sin2x equals (where [.] denotes the greatest integer function)

A
1
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B
tan 10 - 10
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C
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Solution

The correct option is B tan 10 - 10
π=3.14π2=9.86[π2]=[9.86]=10Then limx0tan([π2]x2)tan([π2]x2)sin2x=limx0tan([π2]x2)tan([π2]x2)sin2x=limx0tan(10x2)(10x2).(10)+tan10.x2x2sin2x=(1)(10)+tan10.1(1)2=tan10tan10

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