There is a vivid representation of trigonometric functions—the lines of trigonometric functions.

 

The sine line of angle α is the ordinate of point М (у of point М) (МК).

The cosine line of angle α is the abscissa of point М (х of point М) (ОК).

The tangent line is the tangent to point A.

The tangent line of angle α is the ordinate of point В (у of point В) (АВ).

The cotangent line is tangent to point S.

The cotangent line of angle α is the abscissa of point Р (х of point Р) (SP).

The secant line is OB.

The cosecant line is OP.

Линии тригонометрических функций

The lines of trigonometric functions