October 28th, 2009, 07:50 PM
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 | Flow Master | | Join Date: Dec 2007 Location: Zeitgeist
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Quote:
Originally Posted by kapital  Well, i had so many probles, with english, that i forget.
What I am asking is how can I calulate the value of any cos and sin.
When there is cos180, for example, i look here( http://www.cartage.org.lb/en/themes/...unitcircle.gif) and i can see that this is minus one. But i dont know how to calculate the values of 15,70,120,150,.... . When the value is diffrent than 90,180,270, i dont know how to calulate the value of sinus and cosinus.
And soory again for my bad english. | In those cases you have to use double ange and compound angle formulas together with the known exact values already discussed. eg.  .
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