SOLUTION: If sinA is known to be 0.96, then what can be said about cosA? What if it is also known that angle A is obtuse?

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Question 1179679: If sinA is known to be 0.96, then what can be said about cosA? What if it is also known that angle A
is obtuse?
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
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If sin(A) = 0.96,  then  cos(A) = sqrt%281-sin%5E2%28A%29%29 = sqrt%281-0.96%5E2%29 = +/- 0.28.



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


Solved, answered and explained.