III) CHI
tan 60° -tan 30°
1+tan 60°.tan 30°
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Step-by-step explanation:
Let the two A.P's be a1, a2, a3, .... an, ... 59. 60. (4) (3) and b1 , b2, b3, ...., bn, .... Also, let d be ... In ∆ABD, tan30 AB BD ⇒ 1 3 h x x 3h ...... (1) In ∆ADC, tan60 AC AD C 5 h 5 ⇒ 3 x x 3h . ...
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