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Valores de las funciones Seno y Coseno
para los ángulos múltiplos de 3

$\left\{\vphantom{\begin{array}{lclcl} sen 18^o &=&\displaystyle{\sqrt{3}-1\ov... ... cos 18^o&=&\displaystyle{\sqrt{10+2\sqrt{5}}\over4}& & \end{array}}\right.$ $\begin{array}{lclcl} sen 18^o &=&\displaystyle{\sqrt{3}-1\over 4}&=&\displays... ...& & & \\ cos 18^o&=&\displaystyle{\sqrt{10+2\sqrt{5}}\over4}& & \end{array}$

$\left\{\vphantom{\begin{array}{lcl} sen 21^o &=&\displaystyle{\sqrt{2}\over16... ...2\sqrt{5}+\sqrt{15}}+\sqrt{15}+\sqrt{5}+\sqrt{3}+1\right]} \end{array}}\right.$ $\begin{array}{lcl} sen 21^o &=&\displaystyle{\sqrt{2}\over16}\displaystyle{\l... ...sqrt{3}-2\sqrt{5}+\sqrt{15}}+\sqrt{15}+\sqrt{5}+\sqrt{3}+1\right]} \end{array}$

$\left\{\vphantom{\begin{array}{lcl} sen 24^o &=&\displaystyle{\sqrt{15}+\sqrt... ...4^o&=&\displaystyle{\sqrt{5}+1+\sqrt{30-6\sqrt{5}}\over 8} \end{array}}\right.$ $\begin{array}{lcl} sen 24^o &=&\displaystyle{\sqrt{15}+\sqrt{3}-\sqrt{10-2\sq... ... cos 24^o&=&\displaystyle{\sqrt{5}+1+\sqrt{30-6\sqrt{5}}\over 8} \end{array}$

$\left\{\vphantom{\begin{array}{lcl} sen 27^o & =&\displaystyle{\sqrt{8-2\sqrt... ...^o & =&\displaystyle{\sqrt{8+2\sqrt{10-2\sqrt{5}}}\over 4} \end{array}}\right.$ $\begin{array}{lcl} sen 27^o & =&\displaystyle{\sqrt{8-2\sqrt{10-2\sqrt{5}}}\o... ... cos 27^o & =&\displaystyle{\sqrt{8+2\sqrt{10-2\sqrt{5}}}\over 4} \end{array}$

$\left\{\vphantom{\begin{array}{lcl} sen 30^o & =& \displaystyle{1\over 2} \\ & & \\ cos 30^o & =& \displaystyle{\sqrt{3}\over2} \end{array}}\right.$ $\begin{array}{lcl} sen 30^o & =& \displaystyle{1\over 2} \\ & & \\ cos 30^o & =& \displaystyle{\sqrt{3}\over2} \end{array}$