$\sin {163^o}\cos {347^o} + \sin {73^o}\sin {167^o} = $
$0$
$1/2$
$1$
એકપણ નહિ.
જો ${\rm{cosec}}\theta = \frac{{p + q}}{{p - q}},$ તો $\cot \,\left( {\frac{\pi }{4} + \frac{\theta }{2}} \right) = $
$cot 5^o$ -$tan5^o$ -$2$ $tan10^o$ -$4$ $tan 20^o$ -$8$ $cot40^o$ =
જો a $cos^3 \alpha + 3a \,cos\, \alpha \, sin^2\, \alpha = m$અને $asin^3\, \alpha + 3a \, cos^2\, \alpha \,sin\, \alpha = n$ હોય તો $(m + n)^{2/3} + (m - n)^{2/3}$ =
સાબિત કરો કે : $\cot 4 x(\sin 5 x+\sin 3 x)=\cot x(\sin 5 x-\sin 3 x)$
$\cos 2(\theta + \phi ) - 4\cos (\theta + \phi )\sin \theta \sin \phi + 2{\sin ^2}\phi = $