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cos b = 7/25 --> sin b = - 24/25
cos(a-b) = cos a cos b + sin a sin b = 28/125 -72/125 = -44/125
sin (a-b) = sin a cos b - cos a sin b = 21/125 + 96/125 = 117/125
cot (a-b) = cos (a -b) / sin(a-b) = -44/117