Mashaal Masha
In right triangle RST, the sum of the measures of angle $R$ and angle $S$ is 90 degrees. The value of $\sin(R)$ is $\frac{\sqrt{15}}{4}$. What is the value of $\cos(S)$?
Difficulty: Medium
A: 

$\frac{\sqrt{15}}{15}$

B: 

$\frac{\sqrt{15}}{4}$

C: 

\(\frac{4\sqrt{15}}{15}\)

D: 

$\sqrt{15}$

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