47-8=39 км проехал второй
47+39=86 км расстояние между городами
<span><span>1) 2⋅x⋅cos<span>(x)-</span>sin<span>(x)</span>⋅<span>(<span>x2</span>+1)
</span></span><span>2) <span>cos<span>(x)</span>⋅<span>(1−<span>x2</span>)</span>−4⋅x⋅sin<span>(x)
</span></span></span><span>3) <span>sin<span>(x)</span>⋅<span>(<span>x2</span>−5)</span>−6⋅x⋅cos<span>(x)
</span></span></span><span>4) <span>8⋅x⋅sin<span>(x)</span>+cos<span>(x)</span>⋅<span>(<span>x2</span>−11)
</span></span></span><span>5) <span>10⋅x⋅cos<span>(x)</span>+sin<span>(x)</span>⋅<span>(19−<span>x2</span>)
</span></span></span><span>6) <span>cos<span>(x)</span>⋅<span>(29−<span>x2</span>)</span>−12⋅x⋅sin<span>(x)
</span></span></span><span>7) <span>sin<span>(x)</span>⋅<span>(<span>x2</span>−41)</span>−14⋅x⋅cos<span>(x)
</span></span></span><span>8) <span><span>16⋅x⋅sin<span>(x)</span>+cos<span>(x)</span>⋅<span>(<span>x2</span>−55)</span></span></span></span></span>
Раз одна сторона 30см, значит площадь будет 900кв.см
10см=1дц
=> 100квсм=1кв дц
Ответ: 9кв дц