The ratio between the number of students (s) on a field trip and the number of teachers (t) on the field trip is 21/4. There are
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The question is related to trigonometry and we have to use the formula of double angle .
Here we use double angle formula of tangent function which is
Given expression is
Comparing it with double angle formula, we will get x = 5
SO the required expression is equal to
So the answer is tan(10) .