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" Let "cos(alpha+beta)=(4)/(5)" and "cos...

" Let "cos(alpha+beta)=(4)/(5)" and "cos(alpha-beta)=(3)/(13)" where "0<=alpha,beta<=(pi)/(4)" then : "tan(2 alpha)=

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Let cos(alpha+beta)=(4)/(5) and let sin(alpha-beta)=(5)/(13) , where 0 le alpha , beta=(pi)/(4) . Then tan2alpha=

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Let cos (alpha+beta) = 4/5 and sin(alpha-beta)=5/13 where 0<= alpha,beta<= pi/4 then find tan (2alpha)