complex numbers!
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posted by Валерий
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trigonometry
2. Choose the point that lies on the curve r = 2 – 3 sin θ. A. (5, 3π/2) B. (–2, π) C. (1, π/2) D. (5, π/2 3. Which of the following is not an approximate solution of x5 – 1 = 0? A. 0.3090 – 0.9511i B. 0.8090 +
asked by Erick on November 28, 2012 
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2. Choose the point that lies on the curve r = 2 – 3 sin θ. A. (5, 3π/2)
asked by Erick on December 3, 2012 
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2. Choose the point that lies on the curve r = 2 – 3 sin θ. A. (5, 3π/2) B. (–2, π) C. (1, π/2) D. (5, π/2 3. Which of the following is not an approximate solution of x5 – 1 = 0? A. 0.3090 – 0.9511i B. 0.8090 +
asked by Erick on December 2, 2012 
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2. Choose the point that lies on the curve r = 2 – 3 sin θ. A. (5, 3π/2) B. (–2, π) C. (1, π/2) D. (5, π/2 3. Which of the following is not an approximate solution of x5 – 1 = 0? A. 0.3090 – 0.9511i B. 0.8090 +
asked by Erick on November 28, 2012 
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Please check if i did right! 2. Choose the point that lies on the curve r = 2 – 3 sin θ. A. (5, 3π/2)
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z^4 + 81 = 0 (solve) change it to polar, then take the root. z^4= 81@180 z= 3@180/4 + n90 where n=0, 1, 2, 3 check: z= 3@180/4 + 3*90=3@315 z^4=81@(4*315)=81@1260= 91@180=81 you can check it at the other roots also. this is what
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Could someone help me with this question Write in polar form : sinx  i cosx I've come up to this point, and it's wrong, can't someone please help? =sin(pie/2x)icos(pie/2x) =cosxisinx =cis(x) But the answer is cis(xpie/2)
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Express 52i in polar form. Express your answer in radians to the nearest hundreth. r=sqrt5^2+2i^2 which equals sqrt21.Arctan of 2/5+pi equals 18.7 Polar form=sqrt21 cis 18.7 Is this correct??
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Express 52i in polar form. Express your answer in radians to the nearest hundreth. r=sqrt5^2+2i^2 which equals sqrt21.Arctan of 2/5+pi equals 18.7 Polar form=sqrt21 cis 18.7 Is this correct??
asked by Lucy on September 13, 2008 
PreCalculuscheck answers
Express 52i in polar form. Express your answer in radians to the nearest hundreth. r=sqrt5^2+2i^2 which equals sqrt21.Arctan of 2/5+pi equals 18.7 Polar form=sqrt21 cis 18.7 Is this correct??
asked by Lucy on September 1, 2008