доказать тождество 3-cos^2a-sih^2a=2
3-cos^2a-sih^2a=3-(cos^2a+sih^2a)=3-1=2
cosa=-V(1-sin^2a)=-V(1-16/25)=-3/5
tga=sina/cosa=4/5*-5/3=-4/3
sin2a=2sinacosa=2*4/5*-3/5=-24/25
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3-cos^2a-sih^2a=3-(cos^2a+sih^2a)=3-1=2
cosa=-V(1-sin^2a)=-V(1-16/25)=-3/5
tga=sina/cosa=4/5*-5/3=-4/3
sin2a=2sinacosa=2*4/5*-3/5=-24/25