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If origin is the orthocentre of a triangle formed by the options then
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a
0
b
1
c
2
d
3
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Correct option is D
OA=OB=OC;G=H=O(0,0,0)Equilateral trianglecosα+cosβ=−cosγ,sinα+sinβ=−sinγ,square and add cos(α−β)=−12cos(β−γ)=cos(γ−α)cos(2α−β−γ)=cos(α−β)−(γ−α)=1
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If is an angle given by where are the angles made by a line with the axes respectively then the value of is
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