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Mathematics 19 Online
OpenStudy (anonymous):

The no calculator rule has gotten me...

OpenStudy (anonymous):

Evaluate cot 120° without using a calculator

OpenStudy (amistre64):

dont be so obtuse!! what is 180 - 120 to equate it to a more cute angle

OpenStudy (anonymous):

40?

OpenStudy (amistre64):

.... um, no

OpenStudy (anonymous):

60!

OpenStudy (anonymous):

but that is not a choice

OpenStudy (amistre64):

thats it :) do we know the tangent of a 60 degree angle? i believe its one of 2 standard triangles we memorize

OpenStudy (amistre64):

how about we work thru the problem first before trying to determine the final answer ...

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

ah a 60-30-90

OpenStudy (amistre64):

yes can you tell the tangent of the 60? and then flip it for the cotangent? and the just recognize the quadrant of the original angle to adjust the sign

OpenStudy (anonymous):

x

OpenStudy (amistre64):

|dw:1355239214182:dw|

OpenStudy (anonymous):

beace the triangle is like|dw:1355239314614:dw| and you get 2x/x

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