化简~sosa^2-2a-3/a^2-7a+12

化简~sosa^2-2a-3/a^2-7a+12 1、已知sina=-√3/2,求tana1、已知sina=-√3/2,求tana2、已知sin a/2=4/5 且a是第二象限角,则tan a/2=?3、已知a的终边再射线y=-√3（x＜0）上,求sina sosa tana 帮忙做些高一“解三角形”题正弦定理：变形：求角：sosA= sinB= sinC= 求边：a= b= c= a：b：c= 三角形面积公式：余弦定理求边a^2= b^2= c^2= 求角cosA= cosB= cosC= 英语翻译Well,folks.The Cardinals are now down by 3 runs entering the bottom of the ninth inning with Mark Sosa up to the plate.The bases are loaded.Sosa has gone 0-for-3 this game with two strike outs and a walk.Expectations have been high,and I' RT三角形ABC中,BC AC AB长分别是abc,sinA=a/c,cosA=b/c,tanA=a/c求sinaA、sosA、tabA之间存在的关系,并说明理由.那位大虾帮帮 化简a+2a-3a-4q+5a+6a-7a-8a+...2001a+2002a-2003a-2004a 化简; a-2a+3a-4a+5a-6a+``````-2006a+2007a. 化简：a-2a+3a-4a+5a-6a+.+2010a+2011a. 化简(a+ 3)(a-3) (a-5)(a+7)-2a(a-1) （a+2)(a-2)(a二次方-a)+(2+a)(3-a)(a+3) （a+2)(a-2)(a二次方-7)+(2+a)(3-a)(a+3) a-2a+3a-4a+5a-6a+7a-8a+9a-10a+11a.+99a-100a= 化简（—a^3+3a^2-7a+5）+（5a^-6a)-(a^3-4a+7) 化简（—a^3+3a^2-7a+5）+（5a^-6a)-(a^3-4a+7) [a/(a-1)+a/(a+2)](a+2)/(2a平方+3a+1)化简 化简:[2/3a - 2/(a+b) * (a+b/3a - a - b)] / (a-b)/a 化简(a/a-2-a/a+3)*a^2+a-6/a 5(a*a*b-3*a*a*b)-2*(a*a*b-7*a*b*b) [-a*(-2a)^3*(-a)^5]^7