1. And trigonometrical function table checking method is referenced to reduce large arithmetic amount in the unwrapping process.

2. A new view is put forward about the trigonometrical Function Rational Formula Indefinite Integral, which is, how to make the indefinite integral belong to all the continual periods.

3. Trigonometrical function reflects Yuan Movement and the Movement of mutual conversion and the corresponding linear relationship is the only primary function of the cycle function .

4. By means of trigonometrical progression method and the mainline track spectrum, the sample function of the Chinese mainline railway track random geometric irregularity is simulated.

5. Trigonometrical function in the teaching of mathematics in secondary schools, have a decisive position.

6. The resulting expression is and multiplying out the right-hand side we obtain the required trigonometrical relations.

7. The real world of this relationship Putin still exist, thereby trigonometrical function is a function of the most widely used.

8. In this paper , the deflection and stress function in terms of trigonometrical function and polynomial expression are first proposed.