If $\cos \alpha + \cos \beta = a$ and $\sin \alpha + \sin \beta = b$,then match the items given in List-$A$ with those of their values in List-$B$.
List-$A$List-$B$
$(I)$ $\tan \left(\frac{\alpha + \beta}{2}\right) =$$(a)$ $\frac{b}{a}$
$(II)$ $\cos (\alpha + \beta) =$$(b)$ $\frac{2ab}{a^2 + b^2}$
$(III)$ $\sin (\alpha + \beta) =$$(c)$ $\frac{2ab}{a^2 - b^2}$
$(IV)$ $\tan (\alpha + \beta) =$$(d)$ $\frac{a^2 - b^2}{a^2 + b^2}$

  • A
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (e), (III)$ $\rightarrow (d), (IV)$ $\rightarrow (c)$
  • B
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (c), (III)$ $\rightarrow (b), (IV)$ $\rightarrow (e)$
  • C
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (d), (III)$ $\rightarrow (c), (IV)$ $\rightarrow (b)$
  • D
    $(I)$ $\rightarrow (a), (II)$ $\rightarrow (d), (III)$ $\rightarrow (b), (IV)$ $\rightarrow (c)$

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