this question is unit circle related
you know how the sine and cosine values for pi/4 is square root 2/2 , square root 2/2?
well what if it was -pi/4.. what would the values for sine and cosine be now??
http://images.google.com/imgres?imgurl=https://www-old.math.gatech.edu/~sbishop/2401Spring08/UnitCircle.gif&imgrefurl=https://www-old.math.gatech.edu/~sbishop/2401Spring08/test3studyguide.html&usg=__-jSR0CLy-pjlWIAKhooOMM_cMso=&h=575&w=732&sz=52&hl=en&start=1&um=1&itbs=1&tbnid=b6OyxY_TLZ5-KM:&tbnh=111&tbnw=141&prev=/images%3Fq%3Dunit%2Bcircle%26um%3D1%26hl%3Den%26sa%3DN%26tbs%3Disch:1
so yeah I have no clue what to do, if you put a negative in front of it..
if cosine and sine for pi/2 are 0,1
then what are the values for - pi/2?
thanks
plus whats the general rule of thumb for figuring these out?
you know how the sine and cosine values for pi/4 is square root 2/2 , square root 2/2?
well what if it was -pi/4.. what would the values for sine and cosine be now??
http://images.google.com/imgres?imgurl=https://www-old.math.gatech.edu/~sbishop/2401Spring08/UnitCircle.gif&imgrefurl=https://www-old.math.gatech.edu/~sbishop/2401Spring08/test3studyguide.html&usg=__-jSR0CLy-pjlWIAKhooOMM_cMso=&h=575&w=732&sz=52&hl=en&start=1&um=1&itbs=1&tbnid=b6OyxY_TLZ5-KM:&tbnh=111&tbnw=141&prev=/images%3Fq%3Dunit%2Bcircle%26um%3D1%26hl%3Den%26sa%3DN%26tbs%3Disch:1
so yeah I have no clue what to do, if you put a negative in front of it..
if cosine and sine for pi/2 are 0,1
then what are the values for - pi/2?
thanks
plus whats the general rule of thumb for figuring these out?