Express the complex number 5/2 (cos150° + i sin150°) in standard a + bi form.

1) cos (150°)=- cos(180°-150°) = - cos(30°) and  - cos30° =  - √(3) / 2

sin(150°) = sin(180°-150°) =sin30. and sin30° = 1/2

Then : 5/2(cos 150° + i sin 150°) becomes : 5/2{(-√(3) /2 + I (1/2)]

OR 5/4( - √3 + i)

Step-by-step explanation:

its not b

step-by-step explanation:

341

step-by-step explanation:

all you have to do is 9x31 (which equals 279) and then 20x31 (which equals 620). then you have to subtract. 620-279=341.