未知数 unknown, x-factor, y-factor, z-factor 等式,方程式 equation 一次方程 simple equation 二次方程 quadratic equation 三次方程 cubic equation 四次方程 quartic equation 不等式 inequation 阶乘factorial 对数logarithm 指数,幂 exponent 乘方power 二次方,平方 square 三次方,立方 cube 四次方 the power o...
It is mostly used in two cases such as when the secant square function is equal to the summation of one as well as tangent square function and on the other hand, we also can say that the sum of tangent square function and one is also simplified as secant square function. The formula ...
y的平方即y2则x与y的平方的差就可以表示、解答、解：y的平方即y2则x与y的平方的差就是x-y2、故答案是x-y2。平方差公式（formula for the difference of square）是指两个数的和与这两个数差的积，等于这两个数的平方差、公式中字母的不仅可代表具体的数字、字母、单项式或多项式等代数式。...
Derivative of Sec Square x Formula The formula for the derivative of sec^2x is given by d(sec^2x)/dx = 2 sec^2x tanx. We know that the power rule of differentiation is d(x^n)/dx = n x^(n-1), that is, d(xn)/dx = nxn-1. Using this formula, we can write the formula ...
Calculate {eq}\frac{\partial f}{\partial x}{/eq} and {eq}\frac{\partial f}{\partial y}{/eq} for the function {eq}f{/eq} given below. $$f(x, y) = \int_y^{\int_{-y}^x \cos (e^t) dt} \cos(e^t) dt...
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方差的概念与计算公式，例如 两人的5次测验成绩如下：X： 50，100，100，60，50，平均值E(X)=72；Y：73， 70，75，72，70 平均值E(Y)=72。平均成绩相同，但X 不稳定，对平均值的偏离大。方差描述随机变量对于数学期望的偏离程度。单个偏离是消除符号影响方差即偏离平方的均值，记为E(X)：直接计算公式分...