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OpenStudy (anonymous):
solve 2cos^2 x - cosx - 1 = 0 where 0
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OpenStudy (anonymous):
2cos^2 x - cosx - 1 = 0 2cos^2 x - 2cosx +cosx- 1 = 0 2cosx (cosx-1) + 1(cosx -1) =0 (cosx-1)(2cosx+1) =0 cosx =1,-1/2 hope u can do further..
OpenStudy (anonymous):
thank you so much!
OpenStudy (anonymous):
yw
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