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Math Help - Trigo-sign

  1. #1
    Super Member dhiab's Avatar
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    Trigo-sign

    Stud the sign of :
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  2. #2
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    Quote Originally Posted by dhiab View Post
    Stud the sign of :
    cos(x)+ \sqrt{3} sin(x)= 0 when tan(x)= \frac{sin(x)}{cos(x)}= \frac{1}{\sqrt{3} and that happens when x= \pi/6+ k\pi. sin^2(x)- 1/2= 0 when sin(x)= \pm\frac{1}{\sqrt{2}} and that happens when x= k\pi/4. Those points are the only places you expression can change sign.
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