Posted by Anonymous on Saturday, September 3, 2011 at 4:46pm.
I will do the 2nd one:
sec^-1 (-√2) = Ø , such that sec Ø = -√2
or
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
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?
Also doesnt the cos45 = sqrt2/2 not 1/sqrt 2?
yes, because sqrt2/2 = 1/sqrt2
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