hey, i just realli realli dont understand the restrictions for parameters in trig
so for this question
4. x = 2cos theta , y = 2sin theta
and 0<theta<2 pi
the equation is x squared +y squared = 4
i understand that
but then the restriction is -2>x>2 only
i get that by drawing the cos graph there is a restriction on the y axis as the cos graph is between 2 and -2, but how du u no that the restriction is on the y axis and not on the x axis?
AND why isnt there a restriction for the sin graph, ?? why isnt therre a restriction placed with y ?
im SO LOST !!!
any helpp apreciated !!