他是定义的，没有为什么…只是单位园…
因为cos(α-90)=cos(90-α) 济正堂 白丁 1 cos(α)=cos(-α)所以cos(-α+90)=cos(α-90) sinα=cos(α-90)=cos(90-α) 117.136.23.* 快试试吧,可以对自己使用挽尊卡咯~ ◆ ◆ 一群低能 121.235.21.* 快试试吧,可以对自己使用挽尊卡咯~ ◆ ◆ 楼主上大学很难.这种高一就会的...
Sexual selection, including mate choice and intrasexual competition, is responsible for the evolution of some of the most elaborated and sexually dimorphic traits in animals. Although there is sexual dimorphism in the shape of human faces, it is not clear whether this is similarly due to mate ch...
Why is \frac{1}{3} a good estimate for 0.3? Why is it necessary for the encoding function to be one-to-one? Why Laplace of exp(at) only defined for sa? Explain why f(x)= x^2 - x - 3 has a root in ~[1,3]. How come (2xy^2)^3 is equal to 8x^3y^6? Why can we ...
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白云公司与客户签订空调销售和安装合同，不含增值税的合同总价款为3600元。空调不含增值税的单独售价为 3500元，安装服务的单独售价为200元，该安装服务简单，除白云公司外其他供应商也可以提供此类安装服务。不考虑税费及其他因素，下列各项中，对白云公司上述业务相关会计处理表述错误的是（）。（计算结果保留两位小数...
If object is naive it is presumed to be in system's timezone. from datetime import date, time, datetime, timedelta from dateutil.tz import UTC, tzlocal, gettz Constructors <D> = date(year, month, day) <T> = time(hour=0, minute=0, second=0, microsecond=0, tzinfo=None, fold=0...
The horizontal size of each noise element was equal to the screen pixel size (0.88 min of arc). The noise standard deviation was 0.15. The modulation-depth level of the first-order patterns was 0.063 and that of the second-order patterns were 0.79. Under these conditions, the observers’ ...
滑块沿光滑斜面从顶端向底端做匀加速直线运动，运动到斜面的中点时与运动到底端时所用的时间比值为（ ）
BHT or butyl hydroxytoluene is primarily used to prevent fats in foods from becoming rancid. It is also used in cosmetics, pharmaceuticals, jet fuels, rubber, petroleum products, electrical transformer oil, and embalming fluid. Sure sounds strange that BHT is something that’s used to preserve fo...