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What are the English full names of CSC and SEC in advanced mathematics?
Sine: sine (short for sin) [Saint]

Cosine: Cosine (abbreviated as cos)[k? Usain]

Tangent: Tangent (tan)['t? ndnt]

Cotangent: Cotangent? Won't you? ndnt]

Cutting, cutting? nt]

co section:co secant(CSC)[' kau ' si:k? nt]

Positive Vector: versine (abbreviated as Versin) ['v? :sain]

Cosine: the inverse cosine (vercos)['v? :s? :d][k? Usain]

(where the positive vector and the complementary vector are two discarded functions)