1) a1 = -15
a2 = -8
d = 7
• a10 = a1 + 9d = -15 + 63 = 48
<span>
2) S15 = 2a1 + d (n-1)/2 * n (Подставляете)
3) d = 7 (выше написано как)
4) a3 = a1 + 2d = -15 + 14 = -1 (отрицательный)
a4 = a3 + d = -1 + 7 = 6 (положительный)</span>
F(x)=2x-5x
∫ 2x-5x dx = x²- (5/2)x²+C
f(x)=x²-(5/2)x²+C
F(x)=3cos(x)-x
∫ 3cos(x)-x dx = 3∫ cos(x) dx - ∫ x dx = 3sin(x)-(1/2)x²+C
f(x)=3sin(x)-(1/2)x²+C
F(x)=cos5x-1/6sin3x
∫ cos5x - 1/6sin3x dx = 1/5 sin5x+1/18cos3x+C
f(x)=1/5sin5x+1/18cos3x+C
Ответ:
(3+x)(x-y) по правилу группировки
1. <span>(1-4sinx*cosx)*(sin6x-1)=0</span>
<span>(1-4sin(x)cos(x)) (sin(6x)-1)=0</span>
<span>(sin(6x)-1) (-(4sin(x) cos(x)-1))=0</span>
<span>sin(6x) + 4sin(x)cos(x) - 4sin(6x)sin(x)cos(x)-1=0</span>
<span>2sin(2x)+sin(6x) - cos(4x)+cos(8x) -1=0</span>
<span>x≈2.(3.14159n - 1.4399) n ∈ Z</span>
<span>x≈2.(3.14159n - 0.916298) n ∈ Z</span>
<span>x≈2.(3.14159n + 0.1309 ) n ∈ Z</span>
<span>x≈2.(3.14159n + 0.654498 ) n ∈ Z</span>
<span>x≈0.0833333(12.5664n + 3.14159 ) n ∈ Z</span>