<span>y=(x-1)^2+1 ,y=-(x-3)^2+5
</span>S=∫a,b(f(x)-g(x))dx
найдем пределы интегрирования
(x-1)^2+1=-(x-3)^2+5
x^2-2x+1+1=-x^2+6x-9+5
2x^2-8x+6=0
x^2-4x+3=0
x1=1 x2=3
a=1 b=3
S=∫1,3(-x^2+6x-9+5-(x^2-2x+1+1))dx=∫1,3(-2x^2+8x-6)dx=(-2x^3/3+4x^2-6x)|3,1=-2^3^3/3+4*3^2-6*3+2/3-4+6=-18+36+2/3-4+6=8/3
8*(3/2)^2x-30*(3/2)^x+27=0
(3/2)^x=t
8t²-30t+27=0
D1=15²-8*27=225-216=9
t1=(15+3)/8=18/8=9/4 t2=(15-3)/8=12/8=3/2
(3/2)^x=9/4 (3/2)^x=3/2
(3/2)^x=(3/2)² x=1
x=2
log(2)x+6*1/2log(2)x+9*1/3log(2)x=14
log(2)x+3log(2)x+3log(2)x=14
7log(2)x=14
log(2)x=2
x=2²=4
4) log(9)(6√6-15)²+log(27)(6√6+15)³=2
log(3)(6√6-15)+log(3)(6√6+15)=log(3)(6√6-15)(6√6+15)=log(3)((6√6)²-15²=log(3)(216-225)=log(3)9=2
Cos 4x + cos 2x + √3*cos x = 0
1) cos x = 0;
x1 = pi/2 + pi*k
2) cos 3x = -√3/2
3x = +-11pi/6 + 2pi*n
x2 = +-11pi/18 + 2pi/3*n
2*√3/2*cosx=√3*cosx
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