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Answer» Step-by-step explanation: RHS (cosy-cosx)/(sinx-siny) =[ -2SIN((y+x)/2).SIN((y-x)/2)]÷[2cos((x+y)/2).sin((x-y)/2) =[sin((x+y)/2]÷[COS((x+y)/2] =tan((x+y)/2)

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Step-by-step explanation:

RHS

(cosy-cosx)/(sinx-siny)

=[ -2SIN((y+x)/2).SIN((y-x)/2)]÷[2cos((x+y)/2).sin((x-y)/2)

=[sin((x+y)/2]÷[COS((x+y)/2]

=tan((x+y)/2)

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