How do you evaluate $cos 892°$ ?

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Answer 1 · 2016-05-29T06:33:05

$- cos 8^o=-0.9903$ , nearly.

Use cos (odd multiple of 180-a) $=-cos a$ . Here this angle is in the

second quadrant.

$cos 892^o$

$=cos (900-8)^o$

$= cos (5X180-8)^o$

$=-cos 8^o=-0.9903,$

nearly.

How do you evaluate cos 892° cos 892° ?