Let a, b ≠kπ : . Prove: cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}.
Last edited by mr fantastic; Feb 26th 2011 at 02:06 PM. Reason: Fixed latex tags.
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Originally Posted by arm Let a, b ≠kπ : $a.sin\alpha a\sin\alpha +b. cos\alpha b\cos\alpha = a.sin\beta a\sin\beta +b. cos\beta b\cos\beta =c$. Prove: $cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}$ Hi arm, When you type Latex commands always use the [ math][ /math] to wrap them.
Last edited by Sudharaka; Feb 25th 2011 at 02:50 AM. Reason: math tabs not seen
Originally Posted by arm Let a, b ≠kπ : . Prove: cos^{2}\frac{\alpha- \cos^{2}\frac{\alpha- \beta }{2}=\frac{c^{2}}{a^{2}+b^{2}}. The formatting of what you're trying to prove is unreadable (I am not going to bother editing it to what it should be - you can re-post it in this thread). To get help you need to show some effort. Show your work and say where you're stuck.
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