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.

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- June 8th 2009, 09:18 AMjo74Trig identity
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. - June 8th 2009, 09:38 AMalexmahone
-deleted-

- June 8th 2009, 09:55 AMAmer