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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;

References:

Baidu encyclopedia trigonometric function value