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If the line - segment joining the points...

If the line - segment joining the points `A(x_(1),y_(1))andB(x_(2),y_(2))` subtends an angle `alpha` at the origin O, then find the value of `cosalpha`.

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The correct Answer is:
`=(x_(1)x_(2)+y_(1)y_(2))/(sqrt((x_(1)^(2)+y_(1)^(2))(x_(2)^(2)+y_(2)^(2))))`
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