cos3α=4cosα·cos(π/3+α)cos(π/3-α)tan3a = tan a · tan(π/3+a)· tan(π/3-a)三倍角公式推导 sin3a =sin(2a+a)=sin2acosa+cos2asina 辅助角公式 Asinα+Bcosα=(A^2+B^2)^(1/2)sin(α+t)...
传统意义上常用的诱导公式一共有7组,第一组是涉及到2k\pi的,我们可以理解为在\alpha的基础上转了一圈又一圈,所以所有的值都不发生改变。好了这一组不需要背诵了。tan\alpha和cot\alpha由于互为倒数,所以结论一致,所以在诱导公式里,我们只需要推导出sin\alpha, cos\alpha, tan\alpha就可以了。知道了sin\alpha...
$$\begin{aligned} \Vert f_{\text {NIG}}^{(j)}\Vert _{\infty }\le \frac{\exp (T\delta \alpha )j!}{(T\delta )^{j+1}\pi },\quad j=0,1,2,\ldots \end{aligned}$$We need Lemma 3.7 to obtain a bound for \(B_{f}(L)\). We use the following abbreviation: the maxim...
结果1 题目 { \tan (\pi - \alpha )\cos (2\pi - \alpha )\sin (- \alpha }\div { \cos (- \alpha - \pi )\sin (- \pi - \alpha )}例4值为 A. -2 B. -1 C. 1 D. 2 相关知识点: 试题来源: 解析 B 反馈 收藏 ...
pi }{4}+ \beta \in (\dfrac{\pi }{4},\, \dfrac{\pi }{2}),\sin (\dfrac{\pi }{4}+ \beta )= \dfrac{12}{13},可得\cos (\dfrac{\pi }{4}+ \beta )= \dfrac{5}{13},∴\sin (\alpha + \beta )= \sin [(\dfrac{\pi }{4}+ \beta )-(\dfrac{\pi }{4}-...
varlanguages=require("@cospired/i18n-iso-languages");console.log("German => "+languages.getAlpha2Code('German','en'));// German => deconsole.log("German => "+languages.getAlpha3TCode('German','en'));// German => deuconsole.log("German => "+languages.getAlpha3BCode('German','...
f(α \sin ( \pi - \alpha ) \cos (2 \pi - \alpha ) \sin ( \dfrac{5 \pi }{2}- \alpha ) \cos (- \pi - \alpha ) \cos ( \dfrac{3 \pi }{2}- \alpha ) ,则 f(- \dfrac{25 \pi }{3} 的值为( )A. - \dfrac{1}{2} B. \dfrac{1}{2} C. - \dfrac{...
Let alpha=(pi)/(5) and A,=[[cos alpha,sin alpha-sin alpha,cos alpha]] then B=A^(4)-A^(3)+A^(2)-A is View Solution If alpha=cos((8 pi)/(11))+i sin((8 pi)/(11)) then Re(alpha+alpha^(2)+alpha^(3)+alpha^(4)+alpha^(5)) is ...
即7tan^2\alpha -20tan\alpha -3=0,解得tan\alpha =-\frac{1}{7}或3(不满足\alpha \in(-\frac{\pi}{2},0),舍去),故\frac{cos^2\alpha }{1+sin2\alpha }=\frac{cos^2\alpha }{sin^2\alpha +cos^2\alpha +2sin\alpha cos\alpha }=\frac{1}{tan^2\alpha +1+2tan\alpha ...
varlanguages=require("@cospired/i18n-iso-languages");console.log("German => "+languages.getAlpha2Code('German','en'));// German => deconsole.log("German => "+languages.getAlpha3TCode('German','en'));// German => deuconsole.log("German => "+languages.getAlpha3BCode('German','...