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OpenStudy (anonymous):
cos^-1(cos(9π/8)) without a calculator. I know the answer is 7π/8 but i have no idea how to arrive to that answer?
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OpenStudy (anonymous):
since the first and fourth quadrant has cos equal: cos^-1 [ cos( 2π - 9π/8 ) ] = 7π/8
OpenStudy (anonymous):
thats all?
OpenStudy (anonymous):
Yep!
OpenStudy (anonymous):
omg
OpenStudy (anonymous):
so easy, thanks
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OpenStudy (anonymous):
Just visualize the unit circle, you'll figure out so many interesting facts ;)
OpenStudy (anonymous):
i will!
OpenStudy (anonymous):
:)
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