SOLUTION: Give the exact value of the following. If it is undefined, so state.
1)tan 4pi/3
2)sin 120 degrees
3)cos 5pi/6
I am having trouble figuring out all of the problems like the
Algebra ->
Trigonometry-basics
-> SOLUTION: Give the exact value of the following. If it is undefined, so state.
1)tan 4pi/3
2)sin 120 degrees
3)cos 5pi/6
I am having trouble figuring out all of the problems like the
Log On
Question 212525: Give the exact value of the following. If it is undefined, so state.
1)tan 4pi/3
2)sin 120 degrees
3)cos 5pi/6
I am having trouble figuring out all of the problems like the ones listed. Please help.
You can put this solution on YOUR website! Give the exact value of the following. If it is undefined, so state.
1)tan 4pi/3
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(4/3)pi is 60 degrees in the 3rd quadrant
tan[(4/3)pi] = -sqrt(3)
--------------------------------
2)sin 120 degrees
120 has a reference angle of 60 degrees in the 2nd quadrant
sin(120) = sqrt(3)
--------------------------------
3)cos 5pi/6
(5/6)pi has a reference angle of 30 degrees in the 2nd quadrant:
cos[(5/6)pi] = -cos(30) = -sqrt(3)/2
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Cheers,
Stan H.
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