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Алгебраические формулы

=±Ö1-sin2a=(1-tg2a/2)/(1+tg2a/2)

sina=±Ö1/1+ctg2a=(2tga/2)/(1+tg2a/2)

cos(a)=sinasinbcosacosb

sin(a±)=sinacosb±sinbcosa

tg(a+)=sin(a+b)/cos(a+b)=(tga+tgb)/(1-tgatgb)

tg(a-)=(tga-tgb)/(1+tgatgb)

ctg(a+)=(ctgactgb-1)/(ctga+ctgb)

ctg(a-)=(ctgactgb+1)/(ctgb-ctga)

sin2a=2sinacosa=(2tga)/(1+tg2a)

cos2a=cos2a-sin2a=(1-tg2a)/(1+tg2a)=2cos2a-1=1-2sin2a

tg2a=2tga/(1-tg2a) ctg2a=(ctg2a-1)/2ctga

ctg2a=(ctg2a-1)/2ctga

cos2a/2=1+cosa/2 cos2a=(1+cos2a)/2

sin2a/2=1-cosa/2 sin2a=(1-cos2a)/2

cosa/2=±Ö1+cosa/2

sina/2=±Ö1-cosa/2

tga/2=±Ö1-cosa/1+cosa=(sina)/(1+cosa)=(1-cosa)/sina

ctga/2=±Ö1+cosa/1-cosa=sina/(1-cosa)=(1+cosa)/sina

sina+cosa=Ö2 cos(P/4-a)

sina-cosa=Ö2 sin(a-P/4)

cosa-sina=Ö2 sin(P/4-a)

cosa+cos=2cos(a+b)/2cos(a-b)/2

cosa-cos=-2sin(a+b)/2sin(a-b)/2

sina+sin=2sin(a+b)/2cos(a-b)/2

sina-sin=2sin(a-b)/2cos(a+b)/2

tga±tg=(sin(a±b))/cosacosb

cosacos=1/2(cos(a-b)+cos(a+b))

sinasin=1/2(cos(a-b)-cos(a+b))

sinacos=1/2(sin(a+b)+sin(a-b))

tga=(2tga/2)/(1-tg2a/2)

cosa=±Ö1-sin2a=(1-tg2a/2)/(1+tg2a/2)

sina=±Ö1/1+ctg2a=(2tga/2)/(1+tg2a/2)

cos(a)=sinasinbcosacosb

sin(a±)=sinacosb±sinbcosa

tg(a+)=sin(a+b)/cos(a+b)=(tga+tgb)/(1-tgatgb)

tg(a-)=(tga-tgb)/(1+tgatgb)

ctg(a+)=(ctgactgb-1)/(ctga+ctgb)

ctg(a-)=(ctgactgb+1)/(ctgb-ctga)

sin2a=2sinacosa=(2tga)/(1+tg2a)

cos2a=cos2a-sin2a=(1-tg2a)/(1+tg2a)=2cos2a-1=1-2sin2a

tg2a=2tga/(1-tg2a) ctg2a=(ctg2a-1)/2ctga

ctg2a=(ctg2a-1)/2ctga

cos2a/2=1+cosa/2 cos2a=(1+cos2a)/2

sin2a/2=1-cosa/2 sin2a=(1-cos2a)/2

cosa/2=±Ö1+cosa/2

sina/2=±Ö1-cosa/2

tga/2=±Ö1-cosa/1+cosa=(sina)/(1+cosa)=(1-cosa)/sina

ctga/2=±Ö1+cosa/1-cosa=sina/(1-cosa)=(1+cosa)/sina

sina+cosa=Ö2 cos(P/4-a)

sina-cosa=Ö2 sin(a-P/4)

cosa-sina=Ö2 sin(P/4-a)

cosa+cos=2cos(a+b)/2cos(a-b)/2

cosa-cos=-2sin(a+b)/2sin(a-b)/2

sina+sin=2sin(a+b)/2cos(a-b)/2

sina-sin=2sin(a-b)/2cos(a+b)/2

tga±tg=(sin(a±b))/cosacosb

cosacos=1/2(cos(a-b)+cos(a+b))

sinasin=1/2(cos(a-b)-cos(a+b))

sinacos=1/2(sin(a+b)+sin(a-b))

tga=(2tga/2)/(1-tg2a/2)