An easy one this time

Geometry Level 1

Letting P=sinAsinBQ=sinCcosAR=sinAcosBS=cosAcosCP=\sin A \sin B \\ Q= \sin C \cos A \\ R = \sin A \cos B \\ S=\cos A \cos C

Find the value of 5(P2+Q2+R2+S2)5(P^2+Q^2+R^2+S^2) .

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