Hi, got an identity I need to prove. [tex]\frac{(cos 3A - cos 7A)} / {(sin 7A+sin 3A)}=tan 2A[tex] Any help would be appreciated. Thanks in advance.
Last edited by jo74; Jun 8th 2009 at 10:43 AM.
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Last edited by alexmahone; Jun 8th 2009 at 09:42 PM.
Originally Posted by jo74 Hi, got an identity I need to prove. [tex]\frac{(cos 3A - cos 7A)}{(sin 7A+sin 3A)}=tan 2A[tex] Any help would be appreciated. Thanks in advance. try to solve it with these note sin(-x) = - sin(x)
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