What are the sine, tangent, cosine and cotangent of each angle in trigonometric function?

sin0 = 0sin 90 = 1； sin 180 = 0； sin 270 =- 1； sin 360 = 0；

cos 0 = 1； cos 90 = 0； cos 180 =- 1； cos 270 = 0； cos 360 = 1；

tan0 = 0tan 90 = 1； tan 180 = 0； tan 360 = 0； Tan270 does not exist, 270? Is not the domain of tan function.

Trigonometric function is a kind of transcendental function in elementary function in mathematics. Their essence is the mapping between the set of arbitrary angles and a set of ratio variables. The usual trigonometric function is defined in the plane rectangular coordinate system, and its domain is the whole real number domain. The other is defined in a right triangle, but it is incomplete.

equation

Digital relation

tanαcotα= 1；

sinαCSCα= 1；

cosαsecα= 1；

Relationship of quotient

tanα=sinα/cosα cotα=cosα/sinα

Square relation

Sin? α+cos？ Α= 1;

1+ Tan? α = seconds? Α;

1-cos？ α= CSC？ Α;

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