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&2006-, All rights reserved.化简三角函数式：2√sin8+1 +√2cos8+2_百度知道
化简三角函数式：2√sin8+1 +√2cos8+2
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0原式=2|sin4+cos4|+|2cos4|=-2sin4-2cos4-2cos4=-2sin4-4cos4=-2√5sin(4+a)tana=4/ 分析角度;0sin4+cos4&4=(sin4+cos4)²4&lt：分别化简;2所以4在第三象限sin4&0,cos4&3π&#47：①sin8+1=2sin4cos4+sin²②2cos8+2=2[2(cos4)&#178：π&4+cos² - 1] + 2 =4(cos4)&#178解
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你可能喜欢三角函数需要具体过程cos20cos40cos80=?（sin7+cos15sin8)/(cos7-sin15sin8)=?注：20,40,80,7,15,8为角度数._作业帮
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三角函数需要具体过程cos20cos40cos80=?（sin7+cos15sin8)/(cos7-sin15sin8)=?注：20,40,80,7,15,8为角度数.
三角函数需要具体过程cos20cos40cos80=?（sin7+cos15sin8)/(cos7-sin15sin8)=?注：20,40,80,7,15,8为角度数.
1.cos20cos40cos80 =sin20cos20cos40cos80/sin20 =1/2*sin40cos40cos80/sin20 =1/4*sin80cos80/sin20 =1/8*sin160/sin20 =1/8*sin20/sin20 =1/8 2.(sin7+cos15sin8)/(cos7-sin15sin8) =sin(15-8)+cos15sin8)/(cos(15-8)-sin15sin8) =(sin15cos8-cos15sin8+cos15sin8)/(cos15cos8+sin15sin8-sin15sin8) =(sin15cos8)/(cos15cos8) =sin15/cos15 =tan15 =2-√3角度换算 - 谁动我心的主页
sin61=0.3957&sin62=0.9269&sin63=0.3678&
sin64=0.167&sin65=0.6499&sin1=0.28351&sin2=0.50097&sin3=0.94383&
sin4=0.1253&sin5=0.65816&sin6=0.65346&
sin7=0.14747&sin8=0.06544&sin9=0.23087&
sin10=0.93033&sin11=0.5448&sin12=0.75931&
sin13=0.86497&sin14=0.66773&sin15=0.52074&
sin16=0.99916&sin17=0.7367&sin18=0.9474&
sin19=0.1567&sin20=0.6687&sin21=0.30027&
sin22=0.912&sin23=0.2737&sin24=0.80015&
sin25=0.69944&sin26=0.0774&sin27=0.54675&
sin28=0.8908&sin29=0.33706&sin30=0.99994&
sin31=0.0542&sin32=0.2049&sin33=0.027&
sin34=0.7468&sin35=0.046&sin36=0.4731&
sin37=0.0483&sin38=0.6583&sin39=0.8375&
sin40=0.5392&sin41=0.5073&sin42=0.8582&
sin43=0.4985&sin44=0.9972&sin45=0.5475&
sin46=0.6511&sin47=0.1705&sin48=0.3941&
sin49=0.7719&sin50=0.978&sin51=0.9708&
sin52=0.7219&sin53=0.2928&sin54=0.9474&
sin55=0.9918&sin56=0.0417&sin57=0.4239&
sin58=0.426&sin59=0.1122&sin60=0.4386&&
sin66=0.6009&
sin67=0.4404&sin68=0.7873&sin69=0.2017&
sin70=0.9083&sin71=0.3167&sin72=0.1535&
sin73=0.0354&sin74=0.3189&sin75=0.0683&
sin76=0.9965&sin77=0.2352&sin78=0.8057&
sin79=0.664&sin80=0.208&sin81=0.1378&
sin82=0.5704&sin83=0.322&sin84=0.2733&
sin85=0.7455&sin86=0.8242&sin87=0.5738&
sin88=0.0958&sin89=0.3913&
cos1=0.3913&cos2=0.0958&cos3=0.5738&
cos4=0.8242&cos5=0.7455&cos6=0.2733&
cos7=0.322&cos8=0.5704&cos9=0.1378&
cos10=0.208&cos11=0.664&cos12=0.8057&
cos13=0.2352&cos14=0.9965&cos15=0.0683&
cos16=0.3189&cos17=0.0355&cos18=0.1535&
cos19=0.3168&cos20=0.9084&cos21=0.2017&
cos22=0.7874&cos23=0.4404&cos24=0.6009&
cos25=0.6499&cos26=0.167&cos27=0.3679&
cos28=0.927&cos29=0.3957&cos30=0.4387&
cos31=0.1123&cos32=0.426&cos33=0.424&
cos34=0.0417&cos35=0.9918&cos36=0.9474&
cos37=0.2928&cos38=0.7219&cos39=0.9709&
cos40=0.978&cos41=0.772&cos42=0.3942&
cos43=0.1705&cos44=0.6512&cos45=0.5476&
cos46=0.9974&cos47=0.4985&cos48=0.8582&
cos49=0.5074&cos50=0.5394&cos51=0.8375&
cos52=0.6583&cos53=0.0484&cos54=0.4731&
cos55=0.0462&cos56=0.7468&cos57=0.0272&
cos58=0.2049&cos59=0.0544&cos60=0.0001&
cos61=0.3371&cos62=0.89086&cos63=0.5468&
cos64=0.07746&cos65=0.69944&cos66=0.8004&
cos67=0.2737&cos68=0.9122&cos69=0.30015&
cos70=0.6688&cos71=0.15675&cos72=0.94745&
cos73=0.73677&cos74=0.99916&cos75=0.52074&
cos76=0.66767&cos77=0.86514&cos78=0.75923&
cos79=0.54491&cos80=0.93041&cos81=0.23092&
cos82=0.06546&cos83=0.14749&cos84=0.65346&
cos85=0.65836&cos86=0.12523&cos87=0.943966&
cos88=0.50108&cos89=0.2836&&sin90=1&}