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How do you do sin(18deg) without a calculator?

 Apr 10, 2022
 #1
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How do you do sin(18deg) without a calculator?  

 

Look it up in a book that has the trig tables.  

 Apr 10, 2022
 #2
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OMG, that's so smart, why haven't I thought about that!!!!!!!

 Apr 10, 2022
 #3
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I'm just kidding, but I still need help, how do I solve it algebraically?

 Apr 10, 2022
 #4
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Like this perhaps:

 

 Apr 10, 2022
 #5
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Thank you so much, I've been struggling on this question for a while, but I understand now @Alan!!! smiley

 Apr 10, 2022

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