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how can i determine which of the two trigonometric values is larger in a, b, and c ? a) cos pi/12 or sin pi/12 b) cos 18 degrees or cos 54 degrees c) cos 320 degrees or sin 290 degrees

Mathematics
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look up the unit circle
for cos. The higher the degree up to 90 the lower the value. from 90 to 180 the value increases. for sin it is the opposite. **UNIT CIRCLE**
okay. im checking it out

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Other answers:

|dw:1355083613247:dw|
okay, well for a) it says cos pi/12 and sin pi/12, how will i know where the pi/12 is??
|dw:1355083788207:dw| @ChmE
its half of pi/6
cos is the x value and sin in the y value
you can see the the y value increases to 90 then goes back down. x value it opposite
oh...okay i didnt see that. so then the cos would be larger because its sqrt3/2 ?
|dw:1355084128293:dw|x value is greater than the y value right. more right than up. so cos pi/12 is bigger
correct
so what is b)
cool, i didnt understand this what so ever last time. let me try the next one okay. and ill give u my answer. could u tell me if its right? so cos 18, would be larger than cos 54 right?
right
try C :D
okay let me see
Careful because it is kind of a trick question
it be 320?
WAIT!, wait y
haha y
yes. because sin is negative in this quadrant. It is a big red flag
sin will always be less in quadrant 4
okay, so the sin would mean its smaller so that means the cos will be smaller too
I wouldn't say that
okay thank you so much haha. im trying to correct my last test givin back to me and i got alot wrong cuz i didnt understand lots of things
I hope this helped. Just think of cos as the x value on the circle and sin as the y value on the circle. Always helped me

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