Find the value of cos 36^°

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Find the value of cos18⁰+sin36⁰

sin 18^{\circ} c o s e c 54^{\circ} c o s e c 36^{\circ} sec 72^{\circ} cos 54^{\circ} cos 36^{\circ} .

sin \frac{17 π}{36} cos \frac{11 π}{36} cos \frac{13 π}{36} sin \frac{11 π}{36} sin \frac{13 π}{36} cos \frac{17 π}{36}

sin \frac{17 π}{36} cos \frac{11 π}{36} cos \frac{13 π}{36} sin \frac{11 π}{36} sin \frac{13 π}{36} cos \frac{17 π}{36}

cos (36^{o} - A) cos (36^{o} + A) + cos (54^{o} + A) cos (54^{o} - A)

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