Question
alfa+bita = thita & tan x ratio tan y= x ratio y then prove that sin alfa- bita = x- y ratio x+y sinthita
Answers
Steve
that's alpha, beta, theta
If I read you right, we have
θ = α+β
tanx/tany = x/y
prove: sin(α-β) = (x-y)/(x+y) sinθ
well, sinθ = sin(α+β)
so now we can say we want
sin(α-β)/sin(α+β) = (x-y)/(x+y)
note that
sin(x-y)+sin(x+y) = 2sinx*cosy
sin(x-y)-sin(x+y) = -2cosx*siny
Things should work out from here
If I read you right, we have
θ = α+β
tanx/tany = x/y
prove: sin(α-β) = (x-y)/(x+y) sinθ
well, sinθ = sin(α+β)
so now we can say we want
sin(α-β)/sin(α+β) = (x-y)/(x+y)
note that
sin(x-y)+sin(x+y) = 2sinx*cosy
sin(x-y)-sin(x+y) = -2cosx*siny
Things should work out from here