What is the sine of a 30° angle?

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What is the sine of a 30° angle?

Mathematics
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you need a nice trig cheat sheet
find the coordinates of the point corresponding to the 30 degree angle the first coordinate is cosine, the second coordinate is sine
so, 3/2?

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@satellite73 and why is the 30 and 60 the same? is it 1/2 or 2/3?
3/2*
my professor told me that to find sin30 we have to look at the 30 degree angle.. and use opposite/ hypotenuse
|dw:1434591073159:dw| this is a standard 30 degree and 60 degree triangle
so to look for sin 30 I have to go opposite/hypotenuse so it's like drawing a line from the 1 first and then to the 2 |dw:1434591150637:dw|
sin x = opposite/hypotenuse so my opposite value is 1 and my hypotenuse is 2.. so sin 30 = 1/2
but to go for 60 degrees I have to START at the 60 degree angle.
|dw:1434591242435:dw|
|dw:1434591275310:dw| so opposite/hypotenuse for 60 degrees is \[\frac{\sqrt{3}}{2}\]
the value for triangle is the same but you have to go in a different direction if you want sin 60
Just a head up. I would learn the Unit circle. It will come in handy later on in your studies.
luckily for 45 degrees it's easier
because 45 degrees is everywhere... and the values are the same.. except tan 45 is always 1
|dw:1434591444328:dw|
you need to memorize these triangles... they are super useful for calculus....especially when you're not allowed to use a calculator in exams.

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