KEAM 2011 Math Paper

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Question : 2 of 120

Marks: +1, -0

The distance between the points (a cosα,a sinα) and (a cosβ,a sinβ) is

2|sin(
α−β
2
)|
2|a sin(
α−β
2
)|
2|a cos(
α−β
2
)|
|a cos(
α−β
2
)|
2|a(1−cos(α−β))|

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