Asked by bob

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)
Answered by Writeacher
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Answered by bobpursley
sin2x= 2sinxcosx

cosx(2sinx+1)=0

cosx=0 so x=0, PI, 2PI

sinx=-1/2, so x=3PI/2 check that.
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