What is the value of $\cos(S)$?

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Text

In right triangle

R S T

, the sum of the measures of angle

R

and angle

S

90

degrees. The value of

sin (R)

\frac{2 10}{7}

What is the value of

cos (S)

\frac{3 10}{20}

\frac{2 10}{7}

\frac{7 10}{20}

\frac{2 10}{3}