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If (x)/(y)=(cos A)/(cos B) where A!=B ,t...

If `(x)/(y)=(cos A)/(cos B)` where `A!=B` ,then
(a) `tan(A+B)/(2)=(x tan A+y tan B)/(x+y)`
(b) `tan(A-B)/(2)=(x tan A-y tan B)/(x+y)`
(c) `(sin(A+B))/(sin(A-B))=(y sin A+x sin B)/(y sin A-x sin B)`
(d) `(x cos B-y cos A)/(xcosB+ ycosA)=0`

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