1. $x$ বাস্তব সংখ্যা হলে কোনটি বড়? $\sin(\cos x)$ নাকি $\cos(\sin x)$?
2. Prove that \[\tan\left(\frac{n+1}{2}a\right) =\frac{\sin a+\sin 2a+\ldots+\sin na}{\cos a+\cos 2a+\ldots+\cos na}\]
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- Thu Aug 25, 2016 11:58 am
- Forum: Higher Secondary Level
- Topic: Trigonometry
- Replies: 2
- Views: 7219