Celia bought a bag of 1212 goldfish for \$3$3. What is the cost of 11 goldfish?
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Every point in the unit circle is identified either by its coordinates or by the angle it forms with the x-axis,
.
The trigonometric functions associate with every angle and the correspondant
coordinates the two values
This procedure can be done for every angle , so you don't have to work with acute angles only.