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anonymous
 5 years ago
y=cos(pi/6) I know the answer is sqt3/2 but how do you get that answer?
anonymous
 5 years ago
y=cos(pi/6) I know the answer is sqt3/2 but how do you get that answer?

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i know i can put it into ym calculator, but the answer isnt in pi form. Im not sure how to do so

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0This kind of follows from what the cosine function is defined as. It happens that the \(x\) coordinate of a point on the unit circle that intersects with a line that has an angle of \(\frac{\pi}{6}\) with the x axis is \(\sqrt{\frac{3}{2}}\)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i think i get it now:)

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0how do you determine the domain?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0pi is equal to 180 degrees. 2 pi is a complete circle which is 360 degrees. so you should understand that pi = 180 degrees. y = cos(180/6) so we are talking about a 30 degree angle. y =  cos(30 degree) angle is the same as cos 30 degree angle. There are some basic trig functions you must memorize. One of these is cos (pi/6) = sqrt(3)/2 I don't think the answer is sqrt(3)/2 I think it is sqrt(3)/2 Cosine has the same sign in the 1st and 4th quadrants which is where this is

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The domain of a function is the \(x\) values over which it is defined. The \(\cos\) function happens to be defined over all \(x\), so the domain would be \(\infty<x<\infty\).
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