MCQ
$sin\,10^o$ $sin\,30^o$ $sin\,50^o$ $sin\,70^o$ ની કિમત ....... થાય.
- A$\frac{1}{{36}}$
- B$\frac{1}{{32}}$
- C$\frac{1}{{18}}$
- ✓$\frac{1}{{16}}$
$ = \,\,\sin \,{10^o}\,\sin \,{30^o}\,\sin \,{50^o}\,\sin \,{70^o}$
$ = \,\,\sin \,{30^o}\,\{ \sin \,{10^o}\sin \,({60^o} - {10^o})\,\sin ({60^o} + {10^o})\,\} $
$ = \,\,\sin \,{30^o}\,\left\{ {\frac{1}{4}\sin \,3({{10}^o})} \right\}$
$ = \,\frac{1}{2}\left( {\frac{1}{4} \times \frac{1}{2}} \right)$
$ = \,\frac{1}{{16}}$
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