2.csc is cotangent, which means cotangent. Its English pronunciation is ['k'si? k？ nt]； American pronunciation is ['ko? Is it? k？ nt].？

The spelling of 3.sin is sine, sine, and its English pronunciation is [sa? n]； The American pronunciation is [sa? n].

4. Cosine is spelled as cosine and cosine, and the English pronunciation is ['ksa? n]； American pronunciation is ['ko? Sa? n].

5.cot is spelled cotangent and cotangent, and the English pronunciation is [' k t? ndnt]； American pronunciation is ['ko? t？ ndnt].

6. the spelling of 6.tan is tangent, and its English pronunciation is ['t? ndnt]； The American pronunciation is ['t? ndnt].

Extended data:

First, the basic relationship of trigonometric functions

Second, the numbering rules of inductive formulas

Take α as an acute angle (note that it is "regarded"), and take the sign of trigonometric function according to the quadrant of the obtained angle. That is, "Like a finite number, the symbol looks at the quadrant" (or "Even if it changes singularly, the symbol looks at the quadrant").

In Kπ/2, if k is even, the function name remains the same, and if it is odd, the function name becomes the opposite function name. See the symbol of the quadrant where α is in the original function.

There is a formula about symbols; One is all positive, the other is sine, the third is tangent and the fourth is cosine, that is, the first quadrant is all positive, the second quadrant is all sine, the third quadrant is all cotangent and the fourth quadrant is all cosine.

Or ASTC for short, that is, all, sin, tan+cot and cos are positive in turn. It can also be abbreviated as: the right tan/cot diagonal of cos on sin, that is, the positive values of sin are all above the X axis, the positive values of cos are all on the right side of the Y axis, and the positive values of tan/cot are oblique.

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