1)-sina*sina/tga*sina=-sina:sina/cosa=-sina*cosa/sina=-cosa
2)cosa+cosa-tga+tga=2cosa
(81x^4y^2)(16X^4y^12)=1296x^8 y^14
<span>х+7 дробь 2= х+1 дробь 8</span>
<span>8(х+7)=2(х+1)</span>
<span>8х-2х=2-56</span>
<span>6х=-54</span>
<span>х=-9</span>
<span><span>24-5х=3х-24</span></span>
<span><span>24+24=3х+5х</span></span>
<span><span>48=8х</span></span>
<span><span>х=6</span></span>
<span><span><span>х+4=9дробь х+4</span></span></span>
<span><span><span>(х+4)^2=9</span></span></span>
<span><span><span>х+4=корень из9</span></span></span>
<span><span><span>х+4=3</span></span></span>
<span><span><span>х=-1</span></span></span>
<span><span><span><span>х2-11=0</span></span></span></span>
<span><span><span><span>х2=11</span></span></span></span>
<span><span><span><span>х=5целых и одна вторая</span></span></span></span>
2 sinx-1=0
2 sinx=1
sinx=1|2
x=П/6=30 градусов
Разделим уравнение на cos 2x, получим 3tg 2x-1=o, tg 2x=1/3, 2x=arctg (1/3)+ +Пk, где k любое целое число, х=1/2arctg (1/3)+(Пk)/2