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What is the reciprocal of sin(x), or what is 1/sin(x) equal to in terms of trigonometric ratios? Please answer simply, as I am a high school student, not a mathematician.

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Say you have an angle $x$ (which is acute) inside a right triangle. Then $sin(x)=\frac{\mbox{opp}}{\mbox{hyp}}$, then $\frac{1}{\sin x}$ (which is called $\csc x$, the cosecant), would be $\frac{\mbox{hyp}}{\mbox{opp}}$, this would probably work for a high student... – Daniel Montealegre Mar 21 '12 at 23:42
You may also find it useful to notice that due to $\tan(x)=\frac{\sin(x)}{\cos(x)}$, $\sin(x)=\tan(x)\cos(x)$ (And, as a result. . .) $\frac{1}{\sin(x)}=\frac{1}{\tan(x)\cos(x)}=\cot(x)\sec(x)$. You can find more than enough information at Much of trigonometry is founded in repetition of the same thing in different ways. – 000 Mar 22 '12 at 1:14
$$r = \frac{a}{b} \iff \frac{1}{r} = \frac{b}{a}$$ – user2468 Mar 22 '12 at 1:33
up vote 1 down vote accepted

Once you said it's $\dfrac{1}{\sin x}$, you've already got a "trigonometric ratio". It's also equal to $\dfrac{\sec x}{\tan x}$. Or you can say it's $\dfrac{\text{hypotenuse}}{\text{opposite}}$. All of those are ratios.

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