W推/.-荐-这-些-更-好用http://chilp.it/4f723d?zijwwdgqawvomvvchtixhdbngbqyt-ftvuvptfzudguxcrntexuiiclwounchuikjuipbygikybmkblezl-tzhcznfhvsoffi_bbvlqvazscrpivdmtzquqhnxplssllzkteqnxuiaqol.htmlhttp://chilp 展开
W推/.-荐-这-些-更-好用http://chilp.it/4f723d?zijwwdgqawvomvvchtixhdbngbqyt-ftvuvptfzudguxcrntexuiiclwounchuikjuipbygikybmkblezl-tzhcznfhvsoffi_bbvlqvazscrpivdmtzquqhnxplssllzkteqnxuiaqol.htmlhttp://chilp.it/4f723d?fyxppqdonuzychwogulacjgjqvziu-dfybixibrxajzsbffcpgpymmpsuteucrpvosvfkzustvwctksrvj-ylwgbnbjgstdvd_jqwukbtorrxdyynbyhcahpfcmdbnktzwfbamjnhtcad.html以下纯属凑字数,请无视cosα=[1-tan^2(α/2)]/[1 tan^2(α/2)] sin^2(α) sin^2(α-2π/3) sin^2(α 2π/3)=3/2 tanA tanB=sin(A B)/cosAcosB tanA-tanB=sin(A-B)/cosAcosB cos(A/2)=√((1 cosA)/2) cos(A/2)=-√((1 cosA)/2) cot(A/2)=√((1 cosA)/((1-cosA)) cot(A/2)=-√((1 cosA)/((1-cosA)) tanAtanBtan(A B) tanA tanB-tan(A B)=0tanAtanBtan(A B) tanA tanB-tan(A B)=0b2=a2 c2-2accosBcos4A=1 (-8*cosA^2 8*cosA^4)a3-b3=(a-b(a2 ab b2)cot(A/2)=√((1 cosA)/((1-cosA)) cot(A/2)=-√((1 cosA)/((1-cosA)) cotA cotBsin(A B)/sinAsinB -cotA cotBsin(A B)/sinAsinBtanAtanBtan(A B) tanA tanB-tan(A B)=0 收起