simplify

cos2xcosx+sin2xsinx

a cosx

b sinx

c cos3x

d sin3x

what I tried was....

?

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- June 5th 2009, 05:24 PMbrentwoodbc[SOLVED] double angle
simplify

cos2xcosx+sin2xsinx

a cosx

b sinx

c cos3x

d sin3x

what I tried was....

? - June 5th 2009, 05:30 PMSpec
Use , and

- June 5th 2009, 05:32 PMmr fantastic
- June 5th 2009, 05:38 PMbrentwoodbc
Thank you.