Вчислите
[tex]cos 45 \cdot sin 3105 + \frac{1}{2}\cdot ctg(-315)-cos 270.[/tex]
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Вчислите
[tex]cos 45 \cdot sin 3105 + \frac{1}{2}\cdot ctg(-315)-cos 270.[/tex]
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Verified answer
sin3105=sin(360*8+225)=sin(180+45)=-sin45
-cos45sin45+1/2сtg(45)-cos270=-1/2+1/2-0=0
Verified answer
sin(3105)=sin(45*69)=-V2/2
cos45=V2/2
V2/2*-V2/2=-1/2
ctg(-315)=ctg(7*45)=1
cos270=0
-1/2+1/2*1-0=0
Ответ 0