2006-09-28 07:38:33 · 7 answers · asked by annakinstarkiller 1 in Education & Reference ➔ Homework Help
Remember cosine repeats at every interval of 2π.
Step 1: Subtract 2π from 33π/4 until you get a value less than 2π.
33π/4 then becomes π/4. (33π/4 = 8π + 1/4 π)
Step 2: Find cos π/4.
cos π/4 (i.e. 45 degrees) = √2 / 2 (solution)
2006-09-28 07:45:32 · answer #1 · answered by ³√carthagebrujah 6 · 0⤊ 0⤋
33/4 Ï is 8.25Ï - now - since 2Ï is a circle, bringing yourself around in a circle 4 times is irrelevant, so you are left with .25Ï (Ï/4) - which is 45 degrees (Ï = 180 degrees). The COS of 45 degrees is 0.7071
2006-09-28 14:45:15 · answer #2 · answered by Strangerbarry 4 · 0⤊ 0⤋
cos 33pi/4=cos (33pi/4-32pi/4) the rule being
you can add any no of multiple of 2pi
=cospi/4=1/(rt2)
2006-09-28 14:53:45 · answer #3 · answered by raj 7 · 0⤊ 0⤋
Here is a really good website on the unit circle and math help
http://www.sparknotes.com/testprep/books/sat2/math2c/chapter9section6.rhtml
2006-09-28 14:46:03 · answer #4 · answered by Anonymous · 0⤊ 0⤋
cos(33pi/4) = cos(pi*mod(33,8)/4) =cos(pi/4) = 0.707
2006-09-28 14:49:49 · answer #5 · answered by Helmut 7 · 0⤊ 0⤋
Buy a calculator, for God's sake.
2006-09-28 14:46:02 · answer #6 · answered by Michael A 1 · 0⤊ 1⤋
Star war fan.... just look at this word... CALCULATOR..... CALCULATOR!! But Anakin, in your era or surrounding there must be better device than calculators!!! ;-))
2006-09-28 14:52:08 · answer #7 · answered by Wild_Angel 3 · 0⤊ 1⤋