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A summary of trigonometric function transformation formulas
Trigonometric function is a very important knowledge point in mathematics learning. The following summarizes the transformation formula of trigonometric function, hoping to help everyone.

Transformation formula of trigonometric function sin(-α)=-sinα.

cos(-α)=cosα

sin(π/2-α)=cosα

cos(π/2-α)=sinα

sin(π/2+α)=cosα

cos(π/2+α)=-sinα

Sine (π-α) = Sine α

cos(π-α)=-cosα

Sine (π+α) =-Sine α

tanα=sinα/cosα

tan(π/2+α)=-cotα

tan(π/2-α)=cotα

tan(π-α)=-tanα

tan(π+α)=tanα

Formulas of trigonometric functions of right angle sine: sinA=a/c (that is, the opposite side of angle A is more than the hypotenuse).

Cosine: cosA=b/c (that is, the adjacent side of angle A is more than the hypotenuse).

Tangent: tanA=a/b (that is, the opposite side of angle A is closer to the adjacent side)

Cotangent: cotA=b/a (that is, the adjacent edges of angle A are compared with each other).

SecA=c/b (that is, the hypotenuse of angle A is adjacent to the edge).

Cotangent: cscA=c/a (that is, the hypotenuse of angle A is compared with the edge)