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reproduced in http://blog.csdn.net/zsq306650083/article/details/8772128 1. Vector Point multiplication formula derivation and geometric interpretation 01. The vector point multiplication (dot product) is the sum of the products of each component, and the formula: Write with a plus sign: 02. Geometrical Interpretation: The result of a point multiplication is a scalar that is equal to the product of the v

Today do SICP exercise 1.15, need to use and angle formula, although will write, but forgot how to prove, in MathWorld found a very wonderful proof: Euler's formula has been used here, and it has been documented before, but it is very ingenious to find the points to prove it. ; SICP ex1.15 ; In radians X is very small, the sine of the sinx can be replaced by X. ; and has identities Sinx = 3sin (X/3)-4sin

following data in cell A1:A4:A1:5A2: 3A3: 1A4: 2 Select the range b1:b4 and enter the following formula as an array:=multiply_range (A1:A4)Note: The above formula must be entered as an array formula. To use a formula as an array formula and enter windows in Excel, press C

Reprinted: http://www.zsdhjy.cn/blog/u/161/archives/2010/10711.html 1. Modify the font size and size of formulas in batches In the editing of a mathematical examination paper, the size of the formula is often changed due to typographical requirements. It is not only time-consuming and labor-consuming, but also prone to various errors. If you use the method described below, you can modify the formula size in

Problem: Input the if nested function in the cell of Excel. Because there are too many options, the IF statement is too long. data cannot be copied in the value field using "Data Validity-sequence ), so the problem arises: The formula settings in the Excel cell prompt is too long. What should I do? The formula has not been edited yet. Explanation:The formula

after installing the MathType, use MathType The Insert Formula command in the Insert menu helps us to easily insert formulas in the pages document. Pages is a document processor for the previous iwork suite. Now that Apple is no longer using iwork, but MathType's mathematical formula editor is still compatible with pages 09 and later, given the built-in integration of MathType and pages, it is convenient to

Sometimes we have a royalty formula for each product, and the formula used for this calculation exists in the table in the string format. when we use this formula, it is not like the one we wrote: $ a2 + 3*5; in this way, the result can be calculated simply, and it is a string. therefore, we must convert the string into the result that we can process. sometimes w

Can I use a formula to calculate the user experience?My search for a formula to calculate the user experience comes from an experiment where I can calculate the cognitive loading time of a design. When we talk about the loading speed of an application, we often focus on the loading time of the interface, but we forget that understanding an interface also takes time, known as "cognitive loading time." But as

For the above problems, you can edit each MathType formula, that is, double-click each MathType formula, open the edit window and then exit. This method for the short file, the formula is less good, but encountered a long document, the formula is more than that certainly can not solve the problem. The specific methods

The workaround is as follows: 1. Double-click a formula to enter the edit window of the MathType formula editor, select "Preset"-"Formula preset"-"Load from factory", remove the check in front of "for new formula", and select "OK" in the dialog box. Select Preset-formula