" If "x cos alpha+y sin alpha=x cos beta+y sin beta," show that,"y=x tan(alpha+beta)/(2)

If x cos alpha + y sin alpha = x cos beta + y sin beta "then" "tan" (alpha + beta)/2=

If x cos alpha + y sin alpha = x cos beta + y sin beta = a, 0

If x cos alpha + y sin alpha = x cos beta + y sin beta = 2a then cos alpha cos beta =

If x cos alpha + y sin alpha = x cos beta + y sin beta "then" (2(1-cos (alpha - beta)))/(cos beta - cos alpha)^(2)=

If x=cos alpha+i sin alpha,y=cos beta+isinbeta, then x/y-y/x=

If x cos alpha + y sin alpha = x cos beta + y sin beta "then" (sin alpha - cos alpha - sin beta + cos beta)/(sin alpha + cos alpha - sin beta - cos beta)=

sin alpha sin beta-cos alpha cos beta=1 then show that tan alpha+tan beta=0

If x=cos alpha+i sin alpha,y=cos beta+isinbeta, then (x-y)/(x+y)=

If x= cos alpha+ i sin alpha, y = cos beta+ i sin beta, then prove that (x-y)/(x+y) =i (tan )(alpha-beta)/2