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Question #140b0

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Oct 11, 2016

#sin(2sin^-1(5/13))#

#=2sinsin^-1(5/13)*cossin^-1(5/13)#

#=2xx5/13*coscos^-1sqrt(1-5^2/13^2)#

#=10/13xx12/13=120/169#

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