Question

ПОМОГИТЕ СРОЧНО ЗАДАНИЕ НА ФОТО

Answer 1

$1)\ \int \dfrac{x^4}{x^2-3}\, dx=\int \Big(x^2+3+\dfrac{9}{x^2-3}\Big)\, dx=\dfrac{x^3}{3}+3x+9\cdot \dfrac{1}{2\sqrt3}\cdot ln\Big|\, \dfrac{x-\sqrt3}{x+\sqrt3}\, \Big|+C$

$2)\ \ \int (1-cosx)^2\, dx=\int (1-2cosx+cos^2x)\, dx=\int (1-2cosx+\dfrac{1+cos2x}{2})\, dx=\\\\\\=x-2sinx+\dfrac{1}{2}\, x+\dfrac{sin2x}{4}+C$

$3)\ \ \int sin5x\cdot sin7x\, dx=\dfrac{1}{2}\int (cos2x-cos12x)\, dx=\\\\=\dfrac{1}{2}\cdot \Big(\dfrac{1}{2}\, sin2x-\dfrac{1}{12}\, sin12x\Big)+C$