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April 20, 2014

April 20, 2014

Posted by **Anonymous** on Tuesday, August 7, 2012 at 5:09pm.

representation in polar form?

A. −(4.12, 1.82)

B. (−4.12, −1.33)

C. (4.12, 1.82)

D. (4.12, 4.96)

Change 8 cis 240degrees to rectangular form.

A. -4(Square root 3)-4i

B. -8(Square root 3)-8i

C. -4-4(Square root 3i)

D. -8-8(Square root 3i)

- Trigonometry -
**Reiny**, Tuesday, August 7, 2012 at 7:05pm(-1,4) is in quadrant II

tan^-1 Ø = -4

Ø = 104° or 1.82 radians

the length of r is √(1+16) = √17 = appr 4.12

mmmmhhhh? Can you do something with that?

8 cis 240°

= 8(cos240° + isin240°)

= 8(-1/2 + i(-√3/2)

= -4 - 4√3 i

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