trig
posted by Master chief .
I get that we have to put it into radical form, but I don't understand the process. Can someone walk me through it and explain it?
arccos(1/2)

you want the angle Ø so that
cosØ= 1/2
We know that if the cosØ is negative, then Ø is in either the II or III quadrant
we also know that cos 60° =+1/2
so Ø = 18060 or 180+60
Ø = 120° or 240°
in radians it would be 2π/3 or 4π/3
your calculator will only give you the angle closest to the origin,
inter
2nd
cos
.5
=
and you will get 120 if your calculator is set to degrees. 
(12x2.17)
cos0 120.6
Respond to this Question
Similar Questions

math,correction
Find the area of the rectangle shown in the figure. length = radical (3) + radical (5) width = radical (3) + radical (5) My answer: a= 8 + 2 radical (15) or a = 15.75 agree, you seem to be able to do these should i leave it as the … 
math , help,algebra
i am up to this point in my problem but i don't know what to do next with it can someone show me. Directions: Simplify by combining like terms x radical(18) minus 3radical(8x^2) these are the steps that i've done so far. = x radical … 
math,help
can someone help me plz...last problem simplify (7 + radical (5))(7 radical (5)) for this one i have no idea (a+b)*(ab)= a^2  b^2 memorize that, it is the factors of the difference of squares. In this case, a=7, b= sqrt5 so, it … 
Algebra 2
Ok so I'm suppose to do this Square root of 6 ___________________ Square root of 2 I know when you divide a radical over radical and they have the same what ever it's called (the same number outside of the radical that determines if … 
Math
Why does the division of zero equal one? I just do not understand the process. I've researched it and I have read the responses, but I do not understand them. Can Someone explain it further? 
Chemistry
Okay so I kinda understand where to put the numbers into the formula but i'm not sure how to calculate the distance so could someone kindly walk me through the problem so i can understand it. Thank you so much. Calculate the amount … 
algebra
1.what is the simplest form of the producy sqrt 50x^7y^7 * sqrt 6 xy^4 2. What is the simplest form of the radical expression 4^3 sqrt 3x + 5^3 sqrt 10x 3. What is the simplest form of the radical expression sqrt 2 + sqrt5 / sqrt 2 … 
trig/sig figs
There are 60" in 1', 60' in 1°, and 2π radians in 360°. Convert arcseconds into radians. KEep 6 significant figures. If someone could help and walk me through this process, it would be soooo appreciated! 
Math
Could someone please help me solve this radical equation of 2x+72=x It's suppose to have the radical sign but I don't know how to put it on here. Thank you 
Geometry/Trig
In triangle ABC, A is a right angle, and m b=45 degrees. What is the length of BC?