Question 930421
sec H= 25/24 
cos H = 24/25   {{{sqrt(25^2 - 24^2) = sqrt(49)}}} = 7
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Q IV
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sin H = -7/25
tan H = sin/cos = -7/24
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tan 2H = (2tan H)/(1 - tan^2 H) = {{{(2(-7/24)) / (1 - (49/576)) = (-14/24)/(527/576) = -14*24/527}}}