cos^273^o + cos^247^o + (cos73^o& | vedclass

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Question

$\frac{{1 + \cos {{146}^o }}}{2}$ $+$$\frac{{1 + \cos {{94}^o }}}{2}$ $+$ $\frac{{\cos {{120}^o } + \cos {{26}^o }}}{2}$

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Vedclass · Accepted Answer

$3/4$

Vedclass · Answer

$\frac{{1 + \cos {{146}^o }}}{2}$ $+$$\frac{{1 + \cos {{94}^o }}}{2}$ $+$ $\frac{{\cos {{120}^o } + \cos {{26}^o }}}{2}$

$= 1 +$ $\left[ {\frac{{\cos {{146}^o  }\, + \cos {{94}^o }}}{2}} \right]\,\, - \,\,\frac{1}{4}\, + \,\frac{{\cos {{26}^o }}}{2}$

$= 3/4$

$cos^273^o + cos^247^o + (cos73^o . cos47^o )$ =

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