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write the following complex number in polar form. Express all angles in degrees rounded to the nearest tenth.

 Mar 2, 2019
edited by Guest  Mar 2, 2019
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r  =  sqrt ( 2^2 + (√21)^2 )  =  sqrt ( 4 + 21)  = sqrt (25) = 5

 

 θ = arctan ( √21 / 2) ≈  66.4°  

 

5cos(66.4°) + 5i sin (66.4°)   =  5 [ cos (66.4°  + i sin (66.4° ) ]

 

 

cool cool cool

 Mar 2, 2019

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