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If A + B + C = (3pi)/2, then cos 2A + co...

If `A + B + C = (3pi)/2,` then `cos 2A + cos2B + cos2C` is equal to (i) `1-4cosAcosBcosC` (ii)`4sinAsinBsinC` (iii) `1+2cosAcosBcosC` (iv)`1-4sinAsinBsinC`

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