58*(42,7-2,7)= 58*20=1160
<em>tg п/4 * sin п/3 * ctg п/6</em>
<em>tg п/4 =1</em>
<em>sin п/3 = sqrt(3)/2 (sqrt - корень квадратный)</em>
<em>ctg п/6 =sqrt(3)</em>
<em>1* sqrt(3)/2 * sqrt(3)=1*3/2=3/2</em>
Ответ: 3/2
7÷0.7-7÷(8×0.7)= 7÷7/10 - 7÷(8×7/10)= 10- 7÷28/5= 10- 5/4=10 - 1.25 =8.75
1. arcsin(0.48)=28.69 градусов
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