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白丁 1 可不可以说详细一点 基础很差。。 Dun_Morogh 举人 5 也可以啊,这也是诱导公式 彼岸住民 白丁 1 你把90-a套个负号就知道为什么了 嗨我是小斌 举人 5 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)=co...
The cosine of an angle is equal to the length of the "adjacent" side divided by the length of the "hypotenuse" of a right triangle formed by a horizontal line (called the "adjacent side"), another line (the "hypotenuse") intersecting the first line at the specified angle, and a third...
Why is sec(pi)x = (1/pi)sec x? Why does e^{-\infty}=0? Why is e^pi greater than pi^e? Explain why \frac{\sin x}{x} \leq 1 for -1 \leq x \leq 1, x \neq 0 . Why are we able to transform 4x-2(x-5)=3x into 4x-2x+10?
女性，28岁，因下腹剧痛2小时，伴头晕、恶心，于2001年12月5日急诊入院。 患者平素月经规律，4～5／35天，量多，无痛经，末次月经2001年10月17日，于11月20日开始阴道出血，量较少，色暗且淋漓不净，4天来常感头晕、乏力及小腹痛；两天前曾到某中医门诊诊治，服中药调经后阴道出血量增多，但仍少于平时月经量...
This branch is up to date with mantouxiao/PoC-in-GitHub:master.Folders and files Latest commit Cannot retrieve latest commit at this time. History306 Commits 1999 delete output parameters Dec 12, 2019 2000 delete output parameters Dec 12, 2019 2001 delete output parameters Dec 12, 2019 2002 ...
1—grey bar). The luminance profile of the first-order stimulus in the central 0.5 deg part of the stimulation field was(1)I(x,y)=I01+Csin(2πxfc)+Msin(2πxfm+θ)+Psin(2πxfm),where I0 is mean luminance, C and fc are the contrast and spatial frequency of the high-...
x = (24cos60)t y = (24sin60)t - 5t^2 But going by the mark scheme, it says the next step is to set x and y equal to each other and solve for t. How do I know that x and y would be equal at this point?Follow • 1 Add comment 1 Expert Answer Best Newest Oldest Ph...
He did not want to miss the opportunity, he was satified with it.
Passage If you hold a piece of copper wire over the flame of a wooden match, heat will be conducted by the copper wire to your fingers, and you will be forced to drop the wire. You will, however, stil...