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Exact Trig Values
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Trigonometric functions - Wikipedia
Trigonometric functions - Wikipedia
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Sine, Cosine and Tangent » Jarno Wouda
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ACT Trigonometry: The Complete Guide
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Tangents and Slopes
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The sine, cosine and tangent functions
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Small-angle approximation - Wikipedia
:max_bytes(150000):strip_icc()/google-spreadsheets-trigonometric-functions-58569b975f9b586e02de078a.jpg "Find the Sine, Cosine, and Tangent in Google Spreadsheets")