Question
WHICH ONE DOESN'T BELONG? Identify the expression that does not belong with the other three. Explain your reasoning.
Step 1
$\cos 180^{\circ}$ is equal to -1. $1 \tan \frac{\pi}{4}$ is equal to 1. $\csc \frac{\pi}{2}$ is equal to 1 over $\sin \frac{\pi}{2}$, which is 1/1, that is 1. Show more…
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