Question
$\frac{{\cos 9^\circ + \sin 9^\circ }}{{\cos 9^\circ - \sin 9^\circ }} = $
$= \tan \,\left( {{{45}^o} + {9^o}} \right) = \tan {54^o}$.
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$x+y+z=6$
$2 x+5 y+\alpha z=\beta$
$x+2 y+3 z=14$
के अनन्त हल है. तो $\alpha+\beta$ बराबर है