posted by bob on .
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)
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.
cosx=0 so x=0, PI, 2PI
sinx=-1/2, so x=3PI/2 check that.