Convert 6cis (5pi)/6 to rectangular form.


A. 3 Square root of 3 + 3i


B. -3 Square root of 3 +3i


C. 3 Square root of 3 - 3i


D. -3 Square root of 3 - 3i


E. 3 - 3 Square root of 3 i

Respuesta :

Answer:

B

Step-by-step explanation:

I love these!  Ok, the expanded formula you need for this is

[tex]6(cos\frac{5\pi }{6}+sin\frac{5\pi }{6}i)[/tex]

From the unit circle we get the cos and sin of that angle and fill them in:

[tex]6(-\frac{\sqrt{3} }{2}+\frac{1}{2}i)[/tex]

Distributing through the parenthesis gives you

[tex]-\frac{6\sqrt{3} }{2}+\frac{6}{2}i[/tex]

which simplifies to

[tex]-3\sqrt{3}+3i[/tex]