Question 1179679
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If sin(A) = 0.96,  then  cos(A) = {{{sqrt(1-sin^2(A))}}} = {{{sqrt(1-0.96^2)}}} = +/- 0.28.



If A is an obtuse angle, then cos(A) is negative, so its value is  -0.28.
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Solved, answered and explained.