<h3>cot(x) = 4 ⇒ ctg(x) = 4</h3><h3><u><em>x = arcctg4 + пn, n ∈ Z</em></u></h3><h3><u><em></em></u></h3><h3 />
√(4 + x) = √(2x – 1),
4 + x = 2x – 1,
x = 5, удовлетворяет условию.
Ответ: 5.
<span>Задание: Найдите значение выражения.
:(1+</span><span>
)
= </span><span><span>1
</span>
1) 1+ </span><span>
= 1 </span><span>
2) </span>
:1 <span>
= </span><span>
: </span>1 <span>
= </span><span>
= </span><span>
= </span><span>1 <span>
= </span></span><span><span>1
</span></span>
или
:(1+<span>
)
= 1,3:(1+0,25) = 1,3:1,25=1,04</span>
А+(1-(а+(1-а-1-а)))=а+(1-(а-2а))=а+1+а=2а+1