<PRE><B>Question 981146</B>


Trigonometric form of the number &amp;nbsp;-4&amp;nbsp; is


-4 = 4(cos(180°) + i*sin(180°)),


because &amp;nbsp;&amp;nbsp;cos(180°) = -1, &amp;nbsp;&amp;nbsp;sin(180°) = 0.


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comment from student: Oh okay! So it would be: 4(cos 0° + i sin 0°)?
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NO !!!


It is


-4 = 4(cos(180°) + i*sin(180°)).


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