Homework Help: trip

Posted by bob on Wednesday, March 16, 2011 at 5:01pm.

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)

Trig?? - Writeacher, Wednesday, March 16, 2011 at 5:23pm
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trip - bobpursley, Wednesday, March 16, 2011 at 5:58pm
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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