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by Nabil
Thu Aug 25, 2016 11:58 am
Forum: Higher Secondary Level
Topic: Trigonometry
Replies: 2
Views: 5101

Trigonometry

1. $x$ বাস্তব সংখ্যা হলে কোনটি বড়? $\sin(\cos x)$ নাকি $\cos(\sin x)$?

2. Prove that \[\tan\left(\frac{n+1}{2}a\right) =\frac{\sin a+\sin 2a+\ldots+\sin na}{\cos a+\cos 2a+\ldots+\cos na}\]