sin2xcos2x化简过程

殷瑞矩4683y=2cos2x求导 -
宿花临18260267662 ______[答案] y=2cos2x=9-2sin(2x))*2=-4sin(2x)

殷瑞矩4683Simplify 表示化简 - 上学吧普法考试
宿花临18260267662 ______[答案] sina+cosa =√2(cosa*√2/2+sina*√2/2) =√2(cosacosπ/4+sinasinπ/4) =√2cos(a-π/4)

殷瑞矩46831 - 2sinx²+2sinx 如何化简成 - 2(sinx - 1/2)²+3/2 -
宿花临18260267662 ______[答案] 1-2sinx²+2sinx =1-2(sinx²-sinx) = 1-2(sinx²-sinx +1/4-1/4) =1-2(sinx²-sinx +1/4)-2(-1/4) =1-2(sinx-1/2)²+1/2 =-2(sinx-1/2)²+3/2 明白了吗?

殷瑞矩46831.求下列各三角函数值:(1)sin750º (2)cos22兀/3 (3)tan(—7兀/4)(4)sin900°化简下列各式(1)cos(兀 - a)tan(2兀 - a)tan(兀 - a)/sin(兀+a)(2)sin(2兀+... -
宿花临18260267662 ______[答案] sin750º=1/2 cos22兀/3=-1/2 tan(—7兀/4)=1 sin900°=0 cos(兀-a)tan(2兀-a)tan(兀-a)/sin(兀+a)=tana sin(2兀+a)tan(兀+a)tan(兀-a)/cos(兀+a)tan(3兀-a)=-tan^2a 计算cos(-45°)cos330°tan585°/tan(-120°)=1/4

殷瑞矩4683tan(a+π/4)=2cos2a 怎么化简 -
宿花临18260267662 ______[答案] tan(a+π/4)=2cos2a sin(a+π/4)/cos(a+π/4)=2(cos^2a-sin^2a)√2/2(sina+cosa)/√2/2(cosa-sina)=2(cosa-sina)(cosa+sina)2(cosa-sina)^2=1(cosa-sina)^2=1/21-2sinacosa=1/2sin2a=1/2

殷瑞矩4683求一个结果,sin2x+cos2x的结果是多少? -
宿花临18260267662 ______[答案] 根号2 sin(2x+45度) 辅助角公式:acosx+bsinx=√(a^2+b^2)sin(x+arctan(a/b))

殷瑞矩4683sin(a - 2/π)怎么化? -
宿花临18260267662 ______[答案] 方法一:利用诱导公式sin(a-π/2)=-sin(π/2-a)=-cosa 方法二:利用两角差的正弦公式sin(a-π/2)=sinacosπ/2-cosasinπ/2=-cosa

殷瑞矩4683简单的导数若一个函数的导数是Sin平方(正弦平方),求原函数 -
宿花临18260267662 ______[答案] ∫sin²xdx =∫(1/2)(1-cos2x)dx =(1/2)∫dx-(1/2)∫cos2xdx =x/2-(1/4)∫cos2xd(2x) =x/2-(1/4)sin2x+C 思路: sinx的偶次方,用降幂公式 sinx的奇次方,用凑微分法

殷瑞矩4683y=sin2xcos2x化简怎么到y=sin4x/2的,要具体步骤 -
宿花临18260267662 ______ 三角函数公式sin2t=2sintcost (sin2t)/2=sintcost 令2x=t y=sin2xcos2x=sintcost=(sin2t)/2 2t=4x 所以 y=sin2xcos2x=(sin4x)/2