Convert the polar form complex number `4(cos((2 pi)/3)+i sin((2 pi)/3))` to rectangular form. Give exact answers using fractions and radicals, but no decimals.

Box 1: Enter your answer as a complex number in a+bi form. Example: 2+5i
Enter each value as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
Decimal values are not allowed
Trig functions (sin,cos,etc.) are not allowed