Find the exact value of the following without a calculator. If it is undefined, enter "undefined".
A) $\cos 810^{\circ}$
B) $\sin 855^{\circ}$
C) $\tan \left(-1020^{\circ}\right)$

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The Answer of Find the exact value of the following without a calculator. If it is undefined, enter "undefined".
A) $\cos 810^{\circ}$
B) $\sin 855^{\circ}$
C) $\tan \left(-1020^{\circ}\right)$

Find the Exact Value of the Following Without a Calculator cos⁡810∘\cos 810^{\circ}cos810∘

Find the Exact Value of the Following Without a Calculator $\cos 810^{\circ}$