Write the complex number in polarform Express the argument i

Write the complex number in polarform. Express the argument in degrees, rounded to the nearest tenth, if necessary squareroot 13 + i 4(cos 30degree + i sin 30degree) 2(cos 30degree + i sin 30degree) 4(cos 60degree + i sin60degree) 2(2cos 60degree + i sin 60degree)

Solution

given 3+i = 2(3/2 + i/2 ) = 2( cos30 +i sin30)

we know cos30 = 3/2

sin30 = 1/2

option B