cot α=∠α的邻边 / ∠α的对边 倍角公式 Sin2A=2SinA?CosA Cos2A=CosA^2-SinA^2=1-2SinA^2=2CosA^2-1 tan2A=(2tanA)/(1-tanA^2)(注:SinA^2 是sinA的平方 sin2(A) )三倍角公式 sin3α=4sinα·sin(π/3+α)sin(π/...
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{...
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 ...
\$\cos ( 2 \pi - \alpha ) \sin ( 3 \pi + \alpha ) \cos ( \frac { 3 \pi } { 2 } - \alpha )\$ \$\cos ( - \frac { \pi } { 2 } + \alpha ) \cos ( \alpha - 3 \pi ) \sin ( - \pi - \alpha )\$ 相关知识点: 试题来源: 解析 5.-1 反馈...
If alpha=cos((2 pi)/(5))+i sin((2 pi)/(5)), then find the value of alpha+alpha^(2)+alpha^(3)+alpha^(4) ((1+sin2 alpha)/(cos(2 alpha-2 pi)tan(alpha-(3 pi)/(4)))-(1)/(4)sin2 alpha(cot((alpha)/(2))+cot((3 pi)/(2)+(alpha)/(2)) simplifies and reduces...
结果1 结果2 题目\$ f ( \alpha ) = \frac { \sin ( \pi - \alpha ) \cos ( 2 \pi - \alpha ) \sin \left( - \alpha + \frac { 3 \pi } { 2 } \right) } { \sin \left( \frac { \pi } { 2 } + \alpha \right) \sin ( - \pi - \alpha ) - }\$ ...
alpha .(1)当x= -\dfrac{31\pi }{3}时,即f(-\dfrac{31\pi }{3})= -\cos (\dfrac{31\pi }{3})= -\cos (10\pi + \dfrac{\pi }{3})= -\dfrac{1}{2}.(2)2f(\pi + \alpha )= f(\dfrac{\pi }{2}+ \alpha ),即-2\cos (\pi + \alpha )= -\cos (\dfrac{\p...
[解](1) _ [解](1) _ [解](1) _ [解](1) _ [解](1) _ \$\frac { \sin a \cdot \cos a \cdot \tan \left( - a + \frac { 3 \pi } { 2 } - 2 \pi \right) } { \tan \left( \frac { \pi } { 2 } + a \right) \cdot \sin a }\$ [解](1) ...
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 ...
Get the name of a language by it's ISO 639-1 (Alpha-2), ISO 639-2/T or B (Alpha-3) code varlanguages=require("@cospired/i18n-iso-languages");console.log("de (639-1/Alpha-2) => "+languages.getName("de","en"));// Germanconsole.log("en (639-1/Alpha-2) => "+language...