જો $\sin A + \cos A = \sqrt 2 ,$ તો ${\cos ^2}A = $

 $\cos \frac{{2\pi }}{{28}}\,\cos ec\frac{{3\pi }}{{28}}\, + \,\cos \frac{{6\pi }}{{28}}\,\cos ec\frac{{9\pi }}{{28}} + \cos \frac{{18\pi }}{{28}}\cos ec\frac{{27\pi }}{{28}}$= 

$\sqrt 2 + \sqrt 3 + \sqrt 4 + \sqrt 6 = . . ..$

$\sin \frac{\pi }{{14}}\sin \frac{{3\pi }}{{14}}\sin \frac{{5\pi }}{{14}}\sin \frac{{7\pi }}{{14}}\sin \frac{{9\pi }}{{14}}\sin \frac{{11\pi }}{{14}}\sin \frac{{13\pi }}{{14}}  = . . . .$

જો $\alpha $ અને $\beta $ એ સમીકરણ $sin^2\,x + a\, sin\, x + b = 0$ અને $cos^2\,x + c\, cos\, x + d = 0$ ના બીજો હોય તો $sin\,(\alpha + \beta )$ = 

$\frac{{4\sin {9^o}\sin {{21}^o}\sin {{39}^o}\sin {{51}^o}\sin {{69}^o}\sin {{81}^o}}}{{\sin {{54}^o}}}$ =