Cos85+cos155+cos35=

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$c o s 35^{\circ} + c o s 85^{\circ} + c o s 155^{\circ} =$

\frac{1}{\sqrt{3}}

\frac{1}{\sqrt{2}}

sin 70^{\circ} sin 50^{\circ} - cos 85^{\circ} cos 65^{\circ} =

Value of cos35⁰cos45⁰ is

\frac{cos 35}{sin 55} + \frac{tan 27 tan 63}{sin 30} - 3 (tan 60)^{2}

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