Упростите:
1)sin 2β/sin²β=
2)sin 2α/2sin α - cos α=
3)0,5 tg α sin 2α+cos² α=
дробью писать 1 и 2!
1)sin2B/sin^2b=2cosB/sinB=2ctgB
2)sin2a/2sina-cosa=2sinacosa/2sina-cosa=0
3)0,5tga2sinacosa+cos^2a=0,5sina/cosa2sina+cos^2a=sin^a+cos^2a=1
3)0,5tga2sinacosa+cos^2a=0,5sina/cosa2sina+cos^2a=sin^a+cos^ 2a=1