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Q)

In a $\Delta$ABC if the sides are $a=3,b=5,c=4$ then $\sin\large\frac{B}{2}$$+\cos{\large\frac{B}{2}}$ is equal to

$\begin{array}{1 1}(a)\;a^2&(b)\;b^2\\(c)\;c^2&(d)\;None\;of\;these\end{array}$

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