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If $A + B = 225^\circ$,then $\frac{\cot A}{1 + \cot A} \cdot \frac{\cot B}{1 + \cot B} = $

If $x = \sec \phi - \tan \phi$ and $y = \csc \phi + \cot \phi$,then:

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$\sin 20^{\circ}(4+\sec 20^{\circ})=$

The value of $\cos \frac{2 \pi}{15} \cos \frac{4 \pi}{15} \cos \frac{8 \pi}{15} \cos \frac{14 \pi}{15}$ is :

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