Apply the fraction rule $\frac{a}{c}+\frac{b}{c}=\frac{a+b}{c}$
$=\frac{10+9+4}{30}$
Add the numbers: $ 10+9+4=23$
$=\frac{23}{30}$
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Math question: For a function f(x) = c, if c is a constant, what is the value of f(5)?
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Find the period of the trigonometric function y = 2cos(5x) - sin(3x).
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