Question 552548
tan(cos^-1(7/15))
as a fraction
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A = arccos(7/15)
{{{sin(A) = sqrt(1 - cos^2(7/15)) = sqrt(176/225)}}}
tan = sin/cos = {{{(sqrt(176)/15)/(7/15) = sqrt(176)/7}}}
tan = {{{4sqrt(11)/7}}}