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rudra333Best ResponseYou've already chosen the best response.0
\[\cos ^{1}(\sin \frac{ 11\pi }{ 6 })\]
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
@satellite73 plz help
 one year ago

zugzwangBest ResponseYou've already chosen the best response.1
Play with the values for this one... Let \[x = \cos^{1}(\sin \frac{11\pi}{6})\]and if we get the cosine of both sides, we are left with...\[\cos x = \sin \frac{11\pi}{6}\]perhaps it's simpler from here on in?
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
the answer is 2pi/3 ??
 one year ago

zugzwangBest ResponseYou've already chosen the best response.1
You're right. Hang on... in general, \[\cos(\frac{\pi}{2}  \theta)=\sin(\theta)\] So \[\sin\frac{11\pi}{6}=\cos \left( \frac{\pi}{2}\frac{11\pi}{6} \right)\] \[=\cos \left( \frac{8\pi}{6} \right)\] It would appear \[x=\frac{4\pi}{3}+2k\pi\] where k is any integer. But since we're talking angles, adding 360 degrees, or 2pi, would give the same angle. Consider doing that here, because that negative angle ain't pretty XD \[x = \frac{4\pi}{3}+2\pi=\frac{2\pi}{3}\]
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
k thanks but this other one is hard \[\tan(\sin ^{1}\frac{ 5 }{ 13 }\]
 one year ago

zugzwangBest ResponseYou've already chosen the best response.1
It's a bit complicated, but think of it this way... the SINE of the angle is 5/13, so what is its TANGENT?
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
here's what you do: sine of what angle will equal 5/13? Then you take that angle and take the tan of it.
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
but i how do i do that?
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
answer is 5/12 by the way
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
dw:1358823550014:dw
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
so... tan of theta is ?
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
how did u get 12? and one is negative
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
oops didn't catch the negative
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
so if its negative then it means the angle is either in the third or fourth quadrant
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
however my answer would still be correct if the angle was in the 3rd quadrant
 one year ago

zaynahfBest ResponseYou've already chosen the best response.0
Im sorry, i dont know how to work this out.
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
did the problems include restrictions?
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
but that's all the questions says
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
?? so is there or is there no restrictions like 180<theta<270 (for exmaple)
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
no that is all the question says do u know the answer plz i am confused i will just do others if u don't know this
 one year ago

alanli123Best ResponseYou've already chosen the best response.0
alright... shoot gimme another question
 one year ago

rudra333Best ResponseYou've already chosen the best response.0
it is k i am doing graphing
 one year ago
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