Tan is a tangent function in mathematical functions and one of the most commonly used trigonometric functions. Function belonging to junior high school is not very profound. Generally speaking, it is the variable relationship between numerical value and angle.

Suppose that in triangle ABC, tan is the ratio of the corresponding side of acute angle to the other right-angled side. He still has a lot.

Commonly used numerical and inductive formulas: tan α 0 30 45 60 90120135150180 o √ 31√ 3-65448.

Inductive formula: sin (π+α) =-sin α cos (π+α) =-cos α tan (π+α) = tan α cot (π+α) = cot α sec (π+α) =-sec α CSC (π+α) =-CSC α sin (2kπ+α).