## Elementary Technical Mathematics

The value of $\cos \left( 256{}^\circ \right)$ is $-0.2419$.
Step 1: Open Ti-83. Step 2: Press $cos$ button. Step 3: Enter the value like this, $\cos \left( 256{}^\circ \right)=-0.2419$ The obtained value is $-0.2419$. Hence the value of $\cos \left( 256{}^\circ \right)$ is $-0.2419$.