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Math Help - Evaluate cot without using a calculator.

  1. #1
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    Evaluate cot without using a calculator.

    Hello. The questions I have is

    Evaluate cot 45 without using a calculator by using ratios in a reference triangle.

    I can figure out how to do it with cos, but not cot. I assume I'm missing something really simple on this. If you could please explain to me how I get this answer, I would really appreciate it. Thank you.
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  2. #2
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    Re: Evaluate cot without using a calculator.

    Quote Originally Posted by RiderMind View Post
    Hello. The questions I have is
    Evaluate cot 45 without using a calculator by using ratios in a reference triangle.
    Hint \sin(45^o)=\cos(45^o)~.
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  3. #3
    MHF Contributor MarkFL's Avatar
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    Re: Evaluate cot without using a calculator.

    Hint: your reference triangle will be a right isosceles triangle.
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  4. #4
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    Re: Evaluate cot without using a calculator.

    I'm sorry guys, I'm still completely lost.
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  5. #5
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    Re: Evaluate cot without using a calculator.

    cot 45 = cotangens 45 = cos(45)/sin(45) = ((sqrt(2)/2)/(sqrt(2)/2))=1
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  6. #6
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    Re: Evaluate cot without using a calculator.

    Quote Originally Posted by RiderMind View Post
    I'm sorry guys, I'm still completely lost.
    You had best learn some very basic trigonometry .

    cot(\theta)=\frac{\cos(\theta)}{\sin(\theta)}~.
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