利用三角函数作为一种近似方法，对单摆的动力学方程进行了简化，给出了大角度条件下单摆运动的周期的近似公式。
As an approximate method, with the trigonometric function, the simple pendulum dynamical equation is simplified, and the approximate formula for the period of simple pendulum movement is presented.
在应力偏张量主值三角函数解的基础上，推导了应力空间内主应力和主方向的通用解析解公式。
Based on the stress partial tensor's trigonometric function answer, the main stress and main direction are established in parsed currency formula, and some special answers and examples are discussed.
用倍角公式可将该三角函数方程转化成一个四次代数方程，然后用求根公式直接求出解析解。
Double Angle formula can transform the circular function equation to a biquadratic algebraic equation, and the analysis solution can be solved by extract equation directly.
量块组尺寸计算公式不含三角函数，计算简便、结果精确，特别适合车间现场使用。
As no trigonometric function in the formula results in easy and accurate calculation result, it is especially suitable for workshop applications.
量块组尺寸计算公式不含三角函数，计算简便、结果精确，特别适合车间现场使用。
As no trigonometric function in the formula results in easy and accurate calculation result, it is especially suitable for workshop applications.
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