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a deviantart deep dive by TheDerpClan on DeviantArt
In mathematics, sin, cos, tg, and ctg represent respectively; sina= (opposite side of ∠a)/ (hypotenuse of ∠a), cosa= (adjacent side of ∠a)/ (hypotenuse of ∠a). One is tan, and the other is tg. We often use tan now, tg means tangent function, and ctg means cotangent function.
