Some trig help please.

<p>In each case, express each of the five remaining trigonometric functions in terms of the given function.</p>

<li>tanO</li>
<li>secO</li>
</ol>

<p>[O is for theta.]</p>

<p>For 12, I can only find secO and cotO which are +/-sqrt(1+tan^2 O) and 1/tanO respectively. How do I do the rest?</p>

<p>12</p>

<p>sin/cos = tan
sec/csc = tan
1/cot = tan</p>

<p>14
1/cos = sec
tan*csc=sec
sqrt(1-csc^2)=sec</p>