#1
Do you mean
or
or something else?
#2
cos(90º) = 0
Are you to find ALL solutions? Perhaps the Domain is restricted in some way?
Check your definitions. Are the coordinate axes technically IN the various quadrants?
1)
2cosx-sinx=3/2cosx+sinx
solve all possible ans of x.
2) I got cosx=-1 and 0.4
i am suppose to find all possible ans of x.
i got 66.4 and 293.6 for the 0.4 already.
but how to slove for the -1? the reference angle is 0 and since cos is negative, it should be in the 2nd and 3rd quarant. and thus i got 90 and 180. however the ans is only 180. why?
Because cos(180) = -1 and cos(90) = 0. See this site and look just beneath the applet that graphs the cosine function (though this works just as well). There is a graph of y = cos(x) drawn in the "Did you notice" section.
-Dan
12 cos x - 5 sin x = R cos (x + 22.6)
solve x in range 0 to 360 degrees
(12 cos x- 5 sin x)^2
Also, find the max and min value of eqn.
Kindly explain it clearly because I actually got an explanation from somewhere but it is not clear. Thank you greatly for your help.God bless you.