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sin (nπ/2)可以用 (-1)的多少次幂表示? 可以发现,这不是简单的等比数列,所以只用-1的多少次幂是不能表示出来的,需要有1的多少次幂的配合. 解析看不懂？ 免费查看同类题视频解析. sin (nπ/2)可以用 (-1)的多少次幂表示?

2020年9月15日 · One term of the Fourier series contains the term sin (n*pi/2). This is 0 when n is an even number, 1 when (n-1)/2 is an even number and -1 when (n-1)/2 is a odd number. I wonder if there is a way to write sin (n*pi/2) like you can write cos (n*pi) as (-1)^n? If not, how would you write the sine term in a summation for the Fourier series?

prove\:\tan^2(x)-\sin^2(x)=\tan^2(x)\sin^2(x) \frac{d}{dx}(\frac{3x+9}{2-x}) (\sin^2(\theta))' \sin(120) \lim _{x\to 0}(x\ln (x)) \int e^x\cos (x)dx \int_{0}^{\pi}\sin(x)dx

x^2: x^{\msquare} \log_{\msquare} \sqrt{\square} \nthroot[\msquare]{\square} \le \ge \frac{\msquare}{\msquare} \cdot \div: x^{\circ} \pi \left(\square\right)^{'} \frac{d}{dx} …

2021年8月14日 · We know that that sin(x) represents the y value of a point with the given angle and pi/2 represents a quarter rotation around the circle. So assuming n is an integer the possible values for sin are 1,0&-1.

2016年4月13日 · Question regarding the tangent line of a partial derivative and its graph? here's part of the working , for sin ( , when n = 2 ,4,6 , i would get sin ( nπ / 2) = 0 , but the author …

2020年3月10日 · sinπ/2等于1是因为在三角函数中，sinα表示的是角度为α的正弦值，其中α可以是任意实数。 在直角三角形中，sinα定义为对边长度与斜边长度的比值。 当α等于90度（或π/2弧度）时，对边与斜边重合，不再构成一个真正的三角形。

What is sin (n pi/2) ?

2020年11月10日 · sin2分之nπ表达式是什么啊？ sinnπ/2二sⅰnn (π/2)∴当n二2K (K∈z)时sinn (π/2)二0当n= (2K十1)π时sinn (π/2)二1或一1。