If `w=x+y+z` then `(sin x+ sin y+ sin z- sin w)` is equal to-

If x,y,z are in A.P, then ( sin x - sin z)/( cos z - cos x) is equal to

26. If x,y,z are in A.P,then (sin x-sin z)/(cos z-cos x) is equal to a.tan y b.cot y c.sin y d.cos y

If x,y,z are in A.P.then (sin x-sin z)/(cos z-cos x) is equal to tan y(b)cot y(c)sin y(d)cot y

Prove that : sin x sin y sin (x - y) + sin y sin z sin (y- z)+ sin z sin x sin (z - x) + sin (x - y) sin (y-z)sin (z- x) = 0 .

Prove that, sin x.sin y.sin (xy) + sin y * sin z * sin (yz) + sin z * sin x * sin (zx) + sin (xy) * sin (yz) * sin (zx) = 0

If cos x = tan y, cos y = tan z and cos z = tan x, prove that sin x = sin y = sin z = sin18 ^ (@)

Prove that sin (x + y ) sin (x -y) + sin ( y+ z) sin (y - z) + sin (z+x) sin (z-x) = 0.

cos x + cos y + cos z = 0 and sin x + sin y + sin z, then cos ^(2) (( x-y)/( 2)) =