if A=4142 then sinA=? & cosA=?
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, Cos A = 12 /13 ----( 1 ) We know the Trigonometric identity Sin²A + cos² A = 1. Sin² A + ( 12 /13 )² = 1. Sin² A + 144 / 169 = 1. Sin² A = 1 - ( 144 / 169 ) Sin² A .
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