Add trig addition/subtraction identity exercise · Khan/khan-exercises@6cc9047 · GitHub

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Add trig addition/subtraction identity exercise

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Reviewers: eater

Reviewed By: eater

CC: eater, emily

Differential Revision: http://phabricator.khanacademy.org/D632

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mwittels committed Aug 15, 2012

1 parent b6b1737 commit 6cc9047