Question 208934: Find the exact value of each expression.
a) cot^-1 (1)
and
b) arccos(√2/2)
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! both are 45 degrees,,,,,which has sides 1-1-sqrt2,,,or sqrt2-sqrt2-2
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check, cot =1/1,,,,ok
,
cos = 1/sqrt2 or sqrt2/2
.
ok
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since tan/cot positive in quadrant 3, (a) could also be 225 degrees
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and since cos is positive in quadrant 4, (b) could also be 315 degrees
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