Log√5(25)=4
Так как: √5*√5*√5*√5=5*5=25
5sin^2(3п/4)-3cos^2(п/3)+tg(п)
sin(3пи/4)=sin(пи-пи/4)=sin(пи/4)=√2/2;
cos(пи/3)=1/2;
<span>tg пи=tg(пи-пи) =tg 0=0</span>
<span>Найти множество значений функции y = cos</span>²<span> (x) - sin(x)</span>
Решение
<span>|cosx| ≤ 1</span>
<span> -1 ≤ cosx ≤ 1,
0 ≤ cos</span>²<span>(x) ≤ 1
</span><span>|sin x| ≤ 1
</span><span>-1 ≤ sinx ≤ 1,
</span><span>-1 ≤ -sinx ≤ 1,
</span><span>0 -1 ≤ <span>Cos</span></span>²<span><span>x – sinx </span>≤ 1+ 1
</span><span>-1 ≤ <span>Cos2x – sinx </span>≤ 2</span>
<span>Ответ: [- 1 ; 2].</span>