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trigonometry question

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Anonymous
trigonometry question 2016-05-20 01:47:52 Post No.
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trigonometry question Anonymous 2016-05-20 01:47:52 Post No. [Report]
why is 1/AD = cos(α - π/2)?
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Anonymous 2016-05-20 01:50:05 Post No.124924
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Anonymous 2016-05-20 01:50:05 Post No.124924 [Report]
fuck I forgot to put in the letters, lemme fix
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Anonymous 2016-05-20 01:52:43 Post No.124929
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Anonymous 2016-05-20 01:52:43 Post No.124929 [Report]
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somebody help a poor soul
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Anonymous 2016-05-20 01:57:38 Post No.124931
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Anonymous 2016-05-20 01:57:38 Post No.124931 [Report]
Do you know basic trig?
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Anonymous 2016-05-20 01:58:14 Post No.124933
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Anonymous 2016-05-20 01:58:14 Post No.124933 [Report]
>>124931
I'm learning it
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Anonymous 2016-05-20 02:00:24 Post No.124934
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Anonymous 2016-05-20 02:00:24 Post No.124934 [Report]
>>124933
So you know SOHCAHTOA? Hypotenuse*cos(theta)=adjacent length
alpha is the entire angle but you only need the angle from the triangle so you subtract pi/2 or 90 degrees
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Anonymous 2016-05-20 02:09:15 Post No.124939
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Anonymous 2016-05-20 02:09:15 Post No.124939 [Report]
>>124934
thanks, I'm just caffeinated and underslept, you stating that made me feel dumb when I realised what it was :(
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