If -cos- i sin- b -cos- i sin- c -cos- - isin Y and b - c - c - a - a - b -1 then cos - p -cos - -cos - isequaltoA- 0 B- 1C- 3-2D- -3-2

B/c=cos β+isin β/cos γ+ isin γ×cos γ isin γ/cos γ isin γ ⇒b/c=cos (β γ)+isin (β γ) ......(i) Similarly, c/a=cos(γ β)+sin(α β) ...

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If $α = c o s α + i s i n α, b = c o s β + i s i n β, c = c o s γ + i s i n γ$ and $\frac{b}{c} + \frac{c}{a} + \frac{a}{b} = 1$ then $c o s (β - γ) + c o s (γ - α) + c o s (α - β) i s e q u a l t o$

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α = c o s α + i s i n α, b = c o s β + i s i n β, c = c o s γ + i s i n γ

\frac{b}{c} + \frac{c}{a} + \frac{a}{b} = 1

c o s (β - γ) + c o s (γ - α) + c o s (α - β) i s e q u a l t o

a = cos α + i sin α, b = cos β + i sin β, c = cos γ + i sin γ

\frac{a}{b} + \frac{b}{c} + \frac{c}{a} = - 1

cos (β - γ) + cos (γ - α) + cos (α - β) =

If a=cos $α$ +isin $α$ , b=cos $β$ +isin $β$ ,

c=cos $γ$ +isin $γ$ and $\frac{b}{c}$ + $\frac{c}{a}$ + $\frac{a}{b}$ =1,Then

cos( $β$ - $γ$ )+cos( $γ$ - $α$ )+cos( $α$ - $β$ ) is equal to

a = cos α + i sin α, b = cos β + i sin β,

c = cos γ + i sin γ

\frac{a}{b} + \frac{b}{c} + \frac{c}{a} = 1,

a = cos α - i sin α; b = cos β - i sin β; c = cos γ - i sin γ

(\frac{a^{2} c^{2} - b^{2}}{a b c})

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