These are all the identities and definitions that you need to know for trigonometry questions on ACT Math. For more ACT trigonometry, check out the law of sines and law of cosines.

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For a free list of all the math topics that have recently appeared on the SAT or ACT, and/or for answers to any other questions, you can reach me at robertkohen@koheneducationalservices.com or 212-658-0834.