cos 60°=<span>0.5
----------------</span>
Решение
Log3(x)+logx(3)=3
x > 0, x ≠ 1
Log₃(x) + log₃ (3) / log₃ (<span>x) = 3
log</span>²₃ (x) - 3*log₃ (x) + 1 = 0
<span>log₃ (x) = t
</span>t² - 3t + 1 = 0
D = 9 - 4*1*1 = 5
t₁ = (3 - √5)/2
t₁ = <span>(3 + √5)/2
log</span>₃ (x) = <span>(3 - √5)/2
</span>x₁ = 3^(<span>(3 - √5)/2
</span>x₂ = 3^(<span>(3 + √5)/2</span>