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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 Thankyou 
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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algebra, arithemetic, problem 
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