કિંમત શોધો: $\sin \frac{\pi}{12} \sin \frac{2 \pi}{12} \sin \frac{3 \pi}{12} \sin \frac{4 \pi}{12} \sin \frac{5 \pi}{12} \sin \frac{6 \pi}{12}$

  • A
    $\frac{\sqrt{3}}{16 \sqrt{2}}$
  • B
    $\frac{\sqrt{3}}{8 \sqrt{2}}$
  • C
    $\frac{1}{32}$
  • D
    $\frac{1}{16}$

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$\sin ^4 \frac{\pi}{8}+\sin ^4 \frac{3 \pi}{8}+\sin ^4 \frac{5 \pi}{8}+\sin ^4 \frac{7 \pi}{8} = ?$

પદાવલિનું મૂલ્ય શોધો: $\sum \frac{1}{1 + x^{a-b} + x^{a-c}}$

Difficult
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$\cos^2 \frac{\pi}{12} + \cos^2 \frac{\pi}{4} + \cos^2 \frac{5\pi}{12}$ નું મૂલ્ય શોધો.

અઋણ પૂર્ણાંકો $n$ માટે,$f(n) = \frac{\sum_{k=0}^n \sin \left(\frac{k+1}{n+2} \pi\right) \sin \left(\frac{k+2}{n+2} \pi\right)}{\sum_{k=0}^n \sin ^2\left(\frac{k+1}{n+2} \pi\right)}$ લો. ધારો કે $\cos ^{-1} x$ એ $[0, \pi]$ માં કિંમતો લે છે,તો નીચેનામાંથી કયા વિકલ્પો સાચા છે?
$(1)$ $\sin \left(7 \cos ^{-1} f(5)\right)=0$
$(2)$ $f(4)=\frac{\sqrt{3}}{2}$
$(3)$ $\lim _{n \rightarrow \infty} f(n)=\frac{1}{2}$
$(4)$ જો $\alpha=\tan \left(\cos ^{-1} f(6)\right)$ હોય,તો $\alpha^2+2 \alpha-1=0$

$\sin 10^\circ + \sin 20^\circ + \sin 30^\circ + \dots + \sin 360^\circ$ નું મૂલ્ય શું છે?

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