Trigonometric Identities
Trig Identity Cheat Sheet

Main Trigonometric Identities
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sin²(x) + cos²(x) = 1
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sin(x+y) = sin(x)cos(y) + sin(y)cos(x)
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cos(x+y) = cos(x)cos(y) - sin(x)sin(y)

sin²(x) + cos²(x) = 1
sin(x+y) = sin(x)cos(y) + sin(y)cos(x)
cos(x+y) = cos(x)cos(y) - sin(x)sin(y)