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Completion requirements
Determine the approximate value of sin \(\theta\), cos \(\theta\),
and tan \(\theta\) for each angle. Round to the nearest hundredth.
Make sure your calculator is in degree mode before doing these calculations! If you are unsure of how to do this, please see the Calculator Guide. There are also references on how to use the primary trigonometric ratio functions on your calculator.
-
\(\theta = 30^\circ \)
\(\begin{align}
\sin 30^\circ &= 0.5 \\
\\
\cos 30^\circ &= 0.866... \\
&\doteq 0.87 \\
\\
\tan 30^\circ &= 0.577... \\
&\doteq 0.58 \\
\end{align}\)
-
\(\theta = 70^\circ \)
\(\begin{align}
\sin 70^\circ &= 0.939... \\
&\doteq 0.94 \\
\\
\cos 70^\circ &= 0.342... \\
&\doteq 0.34 \\
\\
\tan 70^\circ &= 2.747... \\
&\doteq 2.75 \\
\end{align}\)
Make sure your calculator is in degree mode before doing these calculations! If you are unsure of how to do this, please see the Calculator Guide. There are also references on how to use the primary trigonometric ratio functions on your calculator.