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[" 2) "96tan($0+120)=m tan(theta-30)],["...

[" 2) "96tan($0+120)=m tan(theta-30)],[" PT "cos2 theta=(m+n)/(2(m-n))]

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if m*tan(theta-30)=n*tan(theta+120), show that cos2 theta=(m+n)/(2(m-n))

if m*tan(theta-30)=n*tan(theta+120) , show that cos2theta=(m+n)/(2(m-n)) .

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If mtan(theta-30^0)=ntan(theta+120^0) then (m+n)/(m-n) is equal to