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Two circles with radii 'r1' and 'r2', r1...

Two circles with radii `'r_1'` and `'r_2', r_1 > r_2 ge 2`, touch each other externally . If `'theta'` be the angle between the direct common tangents , then

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The correct Answer is:
`"sin"(alpha)/2=(r_(1)-r_(2))/(r_(1)+r_(2))`
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