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Thread: Please help!!! Fundamental Identities

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    Exclamation Please help!!! Fundamental Identities

    Write cot(x) in terms of cos(x). You may assume x is in quadrant I.
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    Re: Please help!!! Fundamental Identities

    Quote Originally Posted by johnsonm View Post
    Write cot(x) in terms of cos(x). You may assume x is in quadrant I.
    Can you show $\sin(x)=\cos\left(x-\frac{\pi}{2}\right)~?$

    If so, then $\cot(x)=\dfrac {\cos(x)}{\sin(x)}=~?$
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    Re: Please help!!! Fundamental Identities

    Quote Originally Posted by johnsonm View Post
    Write cot(x) in terms of cos(x). You may assume x is in quadrant I.
    Also $\displaystyle sin(x) =\sqrt{1 - (cos(x))^2}$ since x is in first quadrant.
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