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January 30, 2015

January 30, 2015

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

- Trig?? -
**Writeacher**, Wednesday, March 16, 2011 at 5:23pmPlease 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.

- trip -
**bobpursley**, Wednesday, March 16, 2011 at 5:58pmsin2x= 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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