cos^2x - 2*sinx*cosx + sin^2x + 2*sinx*cosx =
= cos^2x + sin^2x = 1
<u>Основное тригонометрическое тождество! </u>
4-x=15
-x=3,75
x=-3,75
При x=-3,75
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log9 3^(5x - 5) = 4
log9 9^ ((5x-5)/2) = log9 9^4
(5x - 5)/2 = 4
5x - 5 = 8
5x = 13
x = 13/5
x = 2,6
Ответ. 2,6
A) а^4а^2+2аb2b^3+ab^4=ab²(a+b)²
b) <span>а^3b^2-2a^2b^3+ab^4=ab</span>²(a²-2ab+b²)=ab²(a+b)²<span>
</span>v) 4a+4b-ay^2-by2=a(2-y)(2+y)+b(2-y)(2+y)=(2-y)(2+y)(a+b)
g) а-2b-a^3-2ab=a(1-a)(1+a)-2b(1+a)=(1+a)(a-a²-2b)
d) 6a-6b-5b^2+5ab=6(a-b)+5b(a-b)=(a-b)(6+5b)
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