a double integral, 3 ways

a double integral with 3 ways, original way, change of order, use polar coordinate, blackpenredpen, math for fun, https://blackpenredpen.com/bprplive, https://twitter.com/blackpenredpen, [email protected]

• #education
• #blackpenredpen
• #math_for_fun
• #bprplive
• #a_double_integral_with_3_ways
• #original_way
• #change_of_order
• #use_polar_coordinate