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What is the value of $\sin 30 ^ \circ$?

What is the value of $\cos 45 ^ \circ$?

What is the value of $\tan 60 ^ \circ$?

What is the value of $\sin^2 0 ^ \circ + \cos ^2 90 ^ \circ$?

What is the value of $\sin (-360^\circ)$ ?

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