I need some help with the domains of trig equations.
I have solved all the equations i believe with the right answers, , you can recheck it if you feel comfortable.
x = 1/2 and x = -1
x = pi/3 ,5pi/3 and -pi
are these the right answers in the domain x is an element [-pi,pi) - i believe the [ means equal to and the bracket means doesnt equal
sinx=1/2 sinx=-2 - cancels since -2 isnt on the unit circle
x = 30 and 150 degrees -- in the domain [0,360]
cosx=-1 cosx= 1
x = pi and 0 ---- in the domain [-pi,pi]
i just have a hard time with these domains for the trig equations, can someone please check over my answers to see if it fits the domains, or if i have to get rid of some answers or add some answers.
Thank you in advance
cosx-sinx/cosx = 1-tanx
can someone prove this identity for me?