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

三角函数的教学在中学数学教学中有着举足轻重的地位。

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

本文首先选择由三角函数和多项式组成的挠度函数和应力函数。

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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 .

三角函数反映了圆运动和直线运动的相互转化与对应关系，是初等函数中唯一的周期函数。

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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 .

三角函数反映了圆运动和直线运动的相互转化与对应关系，是初等函数中唯一的周期函数。

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