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Write as a single function of asingle angle.cos 20° cos 30° + sin 20° sin 30º = ?
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Write as a single function of asingle angle.cos 20° cos 30° + sin 20° sin 30º = ?

User Ericb
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Consider the trigonometric formula,


\begin{gathered} \cos A=\sin (90-A) \\ \sin A=\cos (90-A) \end{gathered}

The expression is given as,


undefined

User Shivendra
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