for sin2x+cosx=0, use double-angle or half-angle formula to simplify the equation and then find all solutions of the equation in the interval (0,2Pie)
2 answers
Please type your subject in the School Subject box. Any other words, including obscure abbreviations, are likely to delay responses from a teacher who knows that subject well.
sin2x= 2sinxcosx
cosx(2sinx+1)=0
cosx=0 so x=0, PI, 2PI
sinx=-1/2, so x=3PI/2 check that.
cosx(2sinx+1)=0
cosx=0 so x=0, PI, 2PI
sinx=-1/2, so x=3PI/2 check that.
3 answers