sin420°×cos750°+sin(-330°)×cos(-660°)求过程

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sin420°×cos750°+sin(-330°)×cos(-660°)求过程sin420°×cos750°+sin(-330°)×cos(-660°)求过程sin420°×cos750°+sin(

sin420°×cos750°+sin(-330°)×cos(-660°)求过程
sin420°×cos750°+sin(-330°)×cos(-660°)求过程

sin420°×cos750°+sin(-330°)×cos(-660°)求过程
你好,解答如下:
sin420°×cos750°+sin(-330°)×cos(-660°)
=sin60° ×cos30° + sin30° × cos60°
=sin(60° + 30°)
=sin90°
=1

sin420°×cos750°+sin(-330°)×cos(-660°)
=sin60cos30-sin30cos60
=sin(60-30)
=sin30
=1/2

原式=sin(360+60)×cos(720+30)+sin(-360+30)×cos(-720+60)
之后用sin和cos的公式化简,
sin(a+b)=sina*cosb+sinb*cosa
sin(a-b)=sina*cosb-sinb*cosa
cos(a+b)=cosa*cosb-sina*sinb
cos(a-b)=cosa*cosb+sina*sinb

sin420°×cos750°+sin(-330°)×cos(-660°)求过程 计算,sin420°·cos750°+sin(-330°)·cos(-660°) 化简:sin420°乘cos750°+sin(-330°)乘cos(-660°)乘tan(225°) 计算;sin420*cos750+sin[-690]]*cos[-660] sin420°×cos750°+sin(-330°)×cos(-660°)是怎么计算的?请把计算过程详细写下来,我比较笨.在线等,非常感谢各位回答者! 计算sin420 cos750+sin(-330)cos(-660)每个数上有小圆,也就是度!急 计算sin420度乘以cos750度加sin(-330度)乘以cos(-660度) 高一数学必修4第29页B组1.2题 速求1 计算(1)sin420°×cos750°+sin(-330°)×cos(-660°)(2)tan675°+tan765°-tan(-330°)+tan(-690°)(3)sin 25π/6 +cos 25π/3+tan(- 25π/4)2 已知sin(π+α)=- 1/2 计算(1)sin(5 计算sin420度*cos750度+sin(-690度)*cos(-660度)我先在这谢谢你们了 求值tan450°-sin450°+cos750° sin120°+cos750°+sin(-690°)cos(-660°)+tan675°+cot765°-tan1020°+cot(-1230°)等于? 计算(1)sin420度*cos750度+sin(-330度)*cos(-660度) tan675度+tan765度-tan(-330度)+tan(-690度(3)sin25TT/6+cos25TT/3+tan(-25TT/4)要过程 计算:(1)sin420度cos750度+sin(-330度)cos(-660度) (2)tan675度+tan765度-tan(-330度)+tan(-690度)(3)sin25π/6+cos25π/3+tan(-25π/4) 高一必修4三角函数sin420*cos750+sin(-330)*cos(-660)tan675+tan765-tan(-330)+tan(-690)sin(25π/6)+cos(25π/3)+tan(-25π/4)2.已知sin(π+α)=-1/2 计算(1)sin(5π-α) (2)sin(π/2+α) (3)cos(α-3π/2) (4)tan(π/2-α) 化简:tan45°+sin420°×1/tan(-60°)+1/2(sin平方15°+cos平方15°) 1.若sinQ-cosQ=2分之1,则cos^3Q-sin^3Q=2.化简:根号下1-sin²1190°=3.sin(-1200°)+cos6分之47π=4.sin70°×cos750°+sin(-690°)×cos(-660°)=5.sin6分之25π= tan690°=6.sin470°×cos750°+sin(-690°)×cos(-660°)=7. sin420 · cos330 + sin(-690)·cos(-660) sin420°×cos390°×tan405°等于多少要过程啊