Правильно: , sin2(3П/2+ɑ)=cos2ɑ, cos2(3П/2- ɑ)=sin2ɑ, , ccos750=cos300cos450-sin300cos450, sin(900+ɑ)=cosɑ, tg100= ctg800, cos(П/2+ɑ)=-sinɑ, sin(x-y)=sinxcosy-cosxsiny, , cos2ɑ=cos2ɑ - sin2ɑ, sin2a=2sinacosa, , arctg0=0, arcsin0.5=П/6, , , , cos600=0.5, , arcsin(-a) = - arcsina, Неправильно: , sin2(3П/2+ɑ)=sin2ɑ, sin2(3П/2+ɑ)= -cos2ɑ, arctg1=П/2, sin22a+cos22a=2, , , sin(900+a) = - cosa, tg100= tg800, sin(x+y)=sinxcosy-cosxsiny, sin6x = cos23x-sin23x, arccos(-a) =arccosa, , , , , tga·tgb=1, cosП/6= 1/2, ,

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