solve cos (arctan x) = sin (arc cot 3/4)
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cos[90-(90-tan^-1(x)]= sin [ cot^-1(3/4)
sin [90- tan^-1( x)] = sin [ cot^-1(3/4)
90- tan^-1( x) = cot^-1(3/4)
sin [90- tan^-1( x)] = sin [ cot^-1(3/4)
90- tan^-1( x) = cot^-1(3/4)
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