I know some equations are true, like (sin A)^2 + (cos A)^2 = 1 sin (90 - A) = cos A cos (90 - A) = sin A but does these equations have any limitation on the angle A? can A be any real angle? thanks!
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Originally Posted by kenny1999 I know some equations are true, like (sin A)^2 + (cos A)^2 = 1 sin (90 - A) = cos A cos (90 - A) = sin A but does these equations have any limitation on the angle A? can A be any real angle? thanks! I wouldn't be true if it was not applicable to all real values of A.
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