Ալեն Ավետիսյան

sin(π/2-α)=cosαtg(π/2-α)=ctgαcos(π/2-α)=sinαctg(α-π)=ctgαtg(α-π)=tgαcos(3/2π-α)=-sinαsin(α-3/2π)=cosαcos(π+α)=-cosα118sinα=210°=-1/2cosα=210°=-√3/2tgα=210°=√3/3ctgα=210°=√3sinα=5/4π=225°=-√2/2cosα=5/4π=225°=-√2/2tgα=5/4π=225°=1ctgα=5/4π=225°=1sinα=4/3π=240°=-√3/2cosα=4/3π=240°=-1/2tgα=4/3π=240°=√3ctgα=4/3π=240°=√3/3119ctg(90°-α)=tgαcos(90°+α)=-sinαsin(270°-α)=-cosαsin(270°+α)=cosαtg(α-270°)=-ctgαctg(α-180°)=ctgα120cos(810°+α)=- sinαcos(990°-α)=- cosαtg(α-450°)=- ctgαtg(7π-α)=-tgα121cos²(3π/2-x)=0+sin²(x)=sin²(x)tg²(π+x)=tg²π+tg²x=tg²xcos4(π-x)=-cos4(x)=cos4x122ա) sin²(180°-α)+sin²(270°-α)=sin²α+(-cos²α)=sin²α+cos²α=1բ) sin(90°-α)+cos(180°+α)+tg(270°-α)+ctg(360°+α)=sin(90°-α)+cos(180°+α)-ctg α+ctg α=0գ) sin(π+α)cos(π/2+α)-cos(2π+α)sin(3π/2-α)=-sin α×(-sin α)-cos α×(-cos α)=sin²α+cos²α=1դ) tg α tg(π/2+α)tg(π+α)tg(3π/2+α)=tg α×(-ctg α)×tg α tg(3π/2+α)=-tgα × ctgα × tgα × (-ctg α)=tg α×1/tg α×tg α×1/tg α=1