ini namanya integral apa?

Integral Tentu Lipat Dua (Double Definite Integral).
Kalkulus Lanjut.

₂∫⁴ ₁∫² 2 dy dx
Integralkan ₁∫² 2 dy kemudian ₂∫⁴ dx.
₂∫⁴ ₁∫² 2 dy dx
= ₂∫⁴ dx [2x]₁²
= ₂∫⁴ dx [2(2) - 2(1)]
= ₂∫⁴ dx (2)
= 2 [x]₂⁴
= 2 (4 - 2)
= 4