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 May 16th, 2019, 09:10 AM #1 Newbie   Joined: May 2019 From: London Posts: 18 Thanks: 0 algebra problem Rewrite with only sin x and cos x. sin 2x - cos 2x Thank-you
 May 16th, 2019, 09:13 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,921 Thanks: 2203 2sin(x)cos(x) - (cos(x) - sin(x))(cos(x) + sin(x))
 May 16th, 2019, 09:22 AM #3 Newbie   Joined: May 2019 From: London Posts: 18 Thanks: 0 sin(2x) - cos(2x) = 2 sinx cosx -cos2x + sin2x
 May 16th, 2019, 09:22 AM #4 Newbie   Joined: May 2019 From: London Posts: 18 Thanks: 0 Is this correct?
 May 16th, 2019, 09:26 AM #5 Global Moderator   Joined: Dec 2006 Posts: 20,921 Thanks: 2203 Did you mean 2sin x cos x - cos²x + sin²x? The original wording didn't make it clear whether powers of sin x and cos x would be allowed.

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