Знайдіть звгальний вигляд первісних для функцій а) f ( x )= (3x-2)²-(1-2x)³
б) f ( x )= √(3x+1)

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Пошаговое объяснение:

= ∫ ((3x)² - 2*3x*2 + 2² - 1(1³ -3*1²*2x + 3*1*(2x)² - (2x)³)) dx =

= ∫ (9x² - 12x + 4 - (1 - 6x + 12x² - 8x³)) dx =

= ∫ (9x² -12x +4 - 1 +6x -12x² +8x³) dx =

= ∫ (8x³ - 3x² -6x +3) dx =

= ∫ (8x³) dx + ∫ (-3x²) dx + ∫ -6x dx + ∫ 3dx =

= 8 ∫x³ dx - 3 ∫x² dx -6 ∫x dx +3 ∫dx =

= 8*x⁴/4 - 3*x³/3 - 6*x²/2 +3x/1 + C =

= 2x⁴ - x³ - 3x² +3x + C, C=const

= [пусть 3х+1=а, тогда da=(a)' * dx =

= (3x+1)' * dx = 3dx → dx = da / 3] =

= ∫ 1/3 √a da = (1/3) * ∫ √a da =

= (1/3) * ∫ a^(1/2) da =

= (1/3)*(a^(1/2 + 1) / (1/2+1) ) + C=

=(1/3) * (a * √a) / (3/2) + C =

= (1/3) * (a√a) * (2/3) + C =

= 2a√a / 9 + C =

= [ a=3x+1] =

= 2*(3x+1)√(3x+1) / 9 + C, C=const