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9-67.

Colleen and Jolleen both use their calculators to determine sin(30º). Colleen gets sin(30º) = –0.9880316241, but Jolleen gets sin(30º) = 0.5. Is one of their calculators broken, or is something else going on? Why do they get different answers? Homework Help ✎

Try calculating sin(30°) in both degree mode and radian mode on your calculator.