Csc is cotangent, cotangent, and the prefix co- stands for "complementary angle", which is pronounced as [k? Usek. nt]；

In these two pronunciations, note that the k after s should be clouded and pronounced as g.

Sin spell sine, sine, read [s а in];

Cos is the prefix co plus sine, cosine, [k? u ' sаin]；

Tan spell tangent, tangent, [? t？ ndnt]；

Cot or cotangent, cotangent, cotangent, [k? u？ t？ ndnt】。

If it helps you, I hope to adopt it.