change 8 cis 240 degrees to rectangular form

Answer 1

x = rcosθ = (8)(-1/2) = -4
y = rsinθ = 8(-√3/2) = -4√3

so, 8cis240° = -4 - 4√3 i

Answer 2

8 cis 240°
= 8(cos 240° , i sin240°
= 8(-1/2 , -√3/2)
= (-4 , -4√3)

Answer 3

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