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OCW Scholar - Single Variable Calculus 13 Online
OpenStudy (anonymous):

Hello, 2C-10 Is excercise solution wrong or not ? Sine definition looks like cosine

OpenStudy (phi):

yes, the solution confused sin with cos (probably because they were thinking of Snell's law... but Snell's law measures the angle from the vertical, and here we are measuring the angle from the horizontal) See http://openstudy.com/study#/updates/522ad142e4b0a8663d5580c8

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