和平精英s27赛季时间2024
@壤袁5617:cos27°cos57° - sin27°cos147°= - 作业帮
祖转18044187747…… [答案] cos27°cos57°-sin27°cos147° =cos27°cos57°+sin27°sin57° =cos(27°-57°) =cos30° =√3/2
@壤袁5617:cos27°sin33° - cos12°cos72°运用三角公式求值 - 作业帮
祖转18044187747…… [答案] cos27°sin33°-cos12°cos72° = 1/2 * [ sin(33+27)+sin(33-27) - cos(72+12) -cos(72-12)] = 1/2 * [√3/2 + sin6 - 1/2-cos84] =√3/4 - 1/4
@壤袁5617:sec27°等于多少? -
祖转18044187747…… sec27°=1/cos27° ≈1÷0.891 ≈1.122 函数计算器计算,最后结果保留三位小数.
@壤袁5617:化简cos27°cos33° - cos63°cos57°= -
祖转18044187747…… cos27°cos33°-cos63°cos57°=cos(90-63)cos33-cos63cos(90-33)=sin63cos33-cos63sin33=sin(63-33)=sin30=0.5
@壤袁5617:一道高中三角恒等变换题tan9+cot117 - tan243 - cot351求值以上均为度数 - 作业帮
祖转18044187747…… [答案] 原式=tan9-tan27-tan63+tan81=tan9-tan27-cot27+cot9=sin9/cos9 +cos9/sin9-(sin27/cos27+cos27/sin27)=1/sin9cos9-1/sin27cos27=2/sin18-2/sin54=2(sin54-sin18)/sin18sin54=4cos36sin18/sin18sin54=4sin54...
@壤袁5617:化简cos27sin(a - 63) - cos63sin(a+27)怎么化 - 作业帮
祖转18044187747…… [答案] 展开得,cos27sinacos63-cos27cosasin63-cos63sinacos27-cos63cosasin27=-cos27cosasin63-cos63cosasin27=-cosa(cos27sin63+sin27cos63)=-cosasin90=-cosa
@壤袁5617:63比27的化简,要过程!快! -
祖转18044187747…… 63比27=7:3
@壤袁5617:2sin63°*cos( - 27°)+2(cos117°)^2怎么化简做出来不想用计算机 - 作业帮
祖转18044187747…… [答案] 2sin63°*cos(-27°)+2cos²117° =2cos27°*cos27°+2sin²27° =2cos²27°+2sin²27° =2(cos²27°+sin²27°) =2
@壤袁5617:化简cos27°sin(a - 63°) - cos63°sin(a+27°)RT - 作业帮
祖转18044187747…… [答案] cos27°sin(a-63°)-cos63°sin(a+27°) =sin63sin(a-63)-cos63cos(a-63) =-cos(63+a-63) =-cosa
@壤袁5617:cos27°cos18° - sin27°cos72°的值是多少 谢谢了 - 作业帮
祖转18044187747…… [答案] cos27°cos18°-sin27°cos72° =cos27°cos18°-sin27°sin18° =cos(27+18) =cos45 =√2/2
祖转18044187747…… [答案] cos27°cos57°-sin27°cos147° =cos27°cos57°+sin27°sin57° =cos(27°-57°) =cos30° =√3/2
@壤袁5617:cos27°sin33° - cos12°cos72°运用三角公式求值 - 作业帮
祖转18044187747…… [答案] cos27°sin33°-cos12°cos72° = 1/2 * [ sin(33+27)+sin(33-27) - cos(72+12) -cos(72-12)] = 1/2 * [√3/2 + sin6 - 1/2-cos84] =√3/4 - 1/4
@壤袁5617:sec27°等于多少? -
祖转18044187747…… sec27°=1/cos27° ≈1÷0.891 ≈1.122 函数计算器计算,最后结果保留三位小数.
@壤袁5617:化简cos27°cos33° - cos63°cos57°= -
祖转18044187747…… cos27°cos33°-cos63°cos57°=cos(90-63)cos33-cos63cos(90-33)=sin63cos33-cos63sin33=sin(63-33)=sin30=0.5
@壤袁5617:一道高中三角恒等变换题tan9+cot117 - tan243 - cot351求值以上均为度数 - 作业帮
祖转18044187747…… [答案] 原式=tan9-tan27-tan63+tan81=tan9-tan27-cot27+cot9=sin9/cos9 +cos9/sin9-(sin27/cos27+cos27/sin27)=1/sin9cos9-1/sin27cos27=2/sin18-2/sin54=2(sin54-sin18)/sin18sin54=4cos36sin18/sin18sin54=4sin54...
@壤袁5617:化简cos27sin(a - 63) - cos63sin(a+27)怎么化 - 作业帮
祖转18044187747…… [答案] 展开得,cos27sinacos63-cos27cosasin63-cos63sinacos27-cos63cosasin27=-cos27cosasin63-cos63cosasin27=-cosa(cos27sin63+sin27cos63)=-cosasin90=-cosa
@壤袁5617:63比27的化简,要过程!快! -
祖转18044187747…… 63比27=7:3
@壤袁5617:2sin63°*cos( - 27°)+2(cos117°)^2怎么化简做出来不想用计算机 - 作业帮
祖转18044187747…… [答案] 2sin63°*cos(-27°)+2cos²117° =2cos27°*cos27°+2sin²27° =2cos²27°+2sin²27° =2(cos²27°+sin²27°) =2
@壤袁5617:化简cos27°sin(a - 63°) - cos63°sin(a+27°)RT - 作业帮
祖转18044187747…… [答案] cos27°sin(a-63°)-cos63°sin(a+27°) =sin63sin(a-63)-cos63cos(a-63) =-cos(63+a-63) =-cosa
@壤袁5617:cos27°cos18° - sin27°cos72°的值是多少 谢谢了 - 作业帮
祖转18044187747…… [答案] cos27°cos18°-sin27°cos72° =cos27°cos18°-sin27°sin18° =cos(27+18) =cos45 =√2/2