## Related questions with answers

Question

Evaluate exactly all six trigonometric functions of the angle. Use reference triangles and not your calculator.

$420°$

Solution

VerifiedStep 1

1 of 3$420\text{\textdegree}$ is coterminal angles with $420\text{\textdegree}-360\text{\textdegree}=60\text{\textdegree}$ which lies in QI. This means that $\sin 420\text{\textdegree}=\sin 60\text{\textdegree}$, $\cos 420\text{\textdegree}=\cos 60\text{\textdegree}$, and so on. The reference triangle is:

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