Представив 105 градусов как сумму 60+45 вычислите
а)sin 105градусов
б)Cos105градусов
а)sin 105градусов
б)Cos105градусов
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Verified answer
Аsin105=sin(60+45)=sin60cos45+cos60sin45=√3/2*√2/2+1/2*√2/2=
=√2/4*(√3+1)
б
cos105=cos(60+45)=cos60cos45-sin60sin45=1/2*√2/2-√3/2*√2/2=
=√2/4*(1-√3)