Question: If cos c = A , cosy=B, sinc=C and siny=D, find an expression for sin(2x+y) which only involves A, B, C and D

If cos c = A , cosy=B, sinc=C and siny=D, find

If cos c = A , cosy=B, sinc=C and siny=D, find an expression for sin(2x+y) which only involves A, B, C and D

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