What does sec^2(x) / tan(x) simplify to? Simplify by rewriting everything by only sine and cosine functions. \\ \frac{\sec^2 x}{\cot^2x+1} Simplify the following: \dfrac{3 \: tan^4 \theta + 4 \: tan^2 \theta + 1}{3 \; sec^2 \theta}. Rewrite the following expression...
What is the integral of cosx^3 sinx^8 dx [write cosx^3 as cosx(1-sinx^2)] What is dx in an integral? What is the integral of \frac{-x}{y^2} with respect to __x__? What is the Integral of tan^5(x) dx? What does the integral \int \frac{x^2}{\sqrt{x^2+25 \,dx...
就想上杨某宿舍讨个说法，其同宿舍的刘某某一听便陪同曹某某一起去了杨某宿舍。曹某某与杨某争执了几句后，刘某某抄起一张板凳就向杨某的头上砸去，还连砸两下，杨某当场满脸是血。后被送往医院治疗。经法医鉴定，杨某头部被砸开两道口子，构成轻伤。曹某某、刘某某被公安机关刑事拘留。后...
某企业拟建一项固定资产，需投资55万元，按直线法计提折旧，使用寿命为10年，期末有5万元净残值。该项工程建设期为1年，投资额分别于年初投入30万元，年末投入25万元。预计项目投产后每年可增加营业收入15万元、总成本10万元，假定贴现率为10%，试完成下列各题目。 项目的净现值是（ ）万元。
In fact, there isa twice-differentiable functionthat does so of the form f(x)=Ax2+Bx+Csinx+Dcosx. How do you know if a function is differentiable? A function is said to be differentiableif the derivative of the function exists at all points in its domain. Particularly, if a function ...
Since most floating-point calculations have rounding error anyway, does it matter if the basic arithmetic operations introduce a little bit more rounding error than necessary? That question is a main theme throughout this section. The section Guard Digits discusses guard digits, a means of reducing...
Does dot-product distribute over a cross-product? Which one have priority: dot product or cross product? How are dot products useful? Compute the dot product V=i-3j+8k W=-8i+5j-3k why are the two definitions of the dot product equal Use the properties of the dot product to establish ...
有下列离子晶体空间结构示意图：●为阳离子，○为阴离子．以M代表阳离子，N代表阴离子，化学式为MN2的晶体结构为（ ）
两个球的体积之比为8：27，那么这两个球的表面积之比为（ ）
If integral_{-60}^{-30} f (x) dx = 15 and integral_{-60}^{-39} g (x) dx = 28 and integral_{-60}^{-39} h (x) dx = 25, what does the following integral equal? integral_{-60}^{-39} [5 f (x) + 4 g(x) - h ...