Вопрос школьника по предмету Математика
вычислить: 3sin(450)-1/2cos405+2tg225
Ответ учителя по предмету Математика
1)3*sin(450) =3* sin(450-360) =3* sin(90) = 3*1=3
2) 1/2*cos (405_= 1/2 * cos405=1/2* cos (360+45)=1/2* sqrt(2)/2=sqrt(2)
sqrt-корень
3) 2* tg (225)= 2* tg(180+45)=2*1=2
4)3-sqrt(2)+2=5-sqrt(2)
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