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在科学、工程等的计算中,诸如正弦、余弦、正切、余切、指数、对数、反正弦、反余弦、反正切等初等函数是经常应用到的。过去的办法是查三角函数表、对数表或用计算尺。但是与袖珍计算器相比,其精度是远远赶不上的。当然,有一只计算项目多的袖珍计算器,要计算上述诸函数是轻而易举的事。可是要是手头没有计算项目多的袖珍计算器而只有一般的袖珍计算器,那怎么办呢?我们仍然可以通过一些近似公式的计算很快以较高的精度获得所需的函数值。多年来,计算初等函数差不多都是用多项式来逼
In science, engineering, etc., elementary functions such as sine, cosine, tangent, cocut, exponent, logarithm, arcsine, arccosine, arctangent are often applied. The past is to check the trigonometric function table, logarithm table or slide rule. But compared with the pocket calculator, its accuracy is far behind. Of course, there is a pocket calculator that calculates more than one item, and calculating these functions is a breeze. But what if we do not have a pocket calculator on hand and only a pocket calculator in general? We can still get the desired function value quickly and with a high degree of accuracy by some approximate formula. Over the years, the calculation of elementary functions almost always uses polynomials to force