SOLUTION: Please help me figure this out: sec^2 180 degrees

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Question 934256: Please help me figure this out: sec^2 180 degrees
Found 2 solutions by Fombitz, josmiceli:
Answer by Fombitz(32388) About Me  (Show Source):
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+sec%5E2+%28+180+%29+=+1+%2F+cos%5E2+%28+180+%29+
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Use the fact that +cos%28+180+%29+=+-1+
so,
+cos%5E2%28+180+%29+=+%28-1%29%5E2+
+cos%5E2%28+180+%29+=+1+
+1+%2F+cos%5E2+%28+180+%29+=+1%2F1+
+sec%5E2%28+180+%29+=+1+