In order to comprehend cognitive condition of the ninth-grade students who understand the cacute-angle-trigonometric function, in this paper, the following three areas are researched: 1.

The Trigonometric Function Method for Symmetrical Bending of Cantilever Rectangular Plates;

Determination of optimal power of data fitting to characteristic curve of trigonometric function;

Generalization of a Definite Integral Formula about Trigonometric Function;

In this paper,a method of approach to curve & Surface modelling based on triangle function is proposed,which has the principal merits of B-Spline and achieres a C 3 curve.

In this paper,using partially the method of Majorization,we give the supremum and infimum of the triangle function of (k) = ∑sink A - ∑ cosk A(k=3, 5

This paper discusses an algebraic property of values of rational degrees of triangle functions.

Class of quasi-cubic parametric curves based on trigonometric functions;

These ways include the use of simultaneous equations, trigonometric functions and computer aided drawing software.

This paper gives a general equivalent infinitesimal of trigonometric functions,and utilizes the equivalentinfinitesimal to make questions become easy.

The measurement of the efficient depth with triangular function in breast cancer isocenter irradiation orientation;

This paper presents the methods of triangular function for Fitting arbitrary curves.

For each j and σ,n generalised triangular functions and m generalised hyperbolic functions are,respectively,introduced,some properties of them are discussed and some important formulas are given.