Posted by Anonymous on Saturday, September 3, 2011 at 4:46pm.
Write the expression and evaluate. There is only one answer whIch should match the range of the inverse trig function.
trig - Reiny, Saturday, September 3, 2011 at 8:25pm
I will do the 2nd one:
sec^-1 (-√2) = Ø , such that sec Ø = -√2
cos Ø = -1/√2
I know that cos 45° = 1/√2
but the cosine is negative in II and III
so Ø = 180-45° = 135°
or Ø = 180+45 = 225°
They probably expect the answer of 135° or 3π/4 radians
trig - Anonymous, Sunday, September 4, 2011 at 1:56pm
How did you come up with 135 being the answer? I understand what you did but you said it could also be 225, so what makes you pick 135?
trig - Charles, Sunday, September 4, 2011 at 2:17pm
Also doesnt the cos45 = sqrt2/2 not 1/sqrt 2?
trig - Steve, Wednesday, September 21, 2011 at 1:14pm
yes, because sqrt2/2 = 1/sqrt2
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