volume benda putar kurva y=x^2 garis y=2x kuadran 1 diputar 360°

y = x²
y = 2x

x² - 2x= 0
x(x  - 2 ) = 0
x  = 0
x = 2

V = π (0..2) ∫ (2x)² - (x²)² dx
V = π (0..2) ∫ ( 4x² - x⁴) dx
V = π  [ 4/3 x ³ - 1/5 x⁵] (2..0) 
V = π [ 4/3 (8) - 1/5 (32)]
V = π [  32/3 - 32/5]
V = 64/15 π