为了估计剪力对梁变形的影响，在集中力作用下梁内剪力用一个单值连续的反三角函数表示。
To evaluate the effect of shear on deformation of beams, shear in beams under the action of a concentrated load is expressed in terms of a single-valued continuous inverse trigonometric function.
提出了用三角函数表示的一类用于油田开发指标预测的增长曲线共6条，从而进一步完善和丰富了现有的增长曲线法。
Six growth curves used for prediction of oilfield development indexes expressed with trigonometric function are proposed, thus perfecting and abounding in the existed growth curve methods further.
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