" 6.If "sin x+sin y+sin z=3" .Find the value of "cos x+cos y+cos z

If sin x+ sin y+ sin z=3, then the value of (cos x+ cos y+ cos z) is-

If sin x + sin y + sin z = 0 and cos x + cos y + cos z = 0 then prove that cot (x+y)/2 = cot z and cos (x-y)/2 = pm 1/2

If (sinx + sin y ) = a and (cos x + cos y ) = b what is the value of sin x sin y + cos x cos y ?

If sin x+sin y=3(cos y-cos x) then the value of sin 3 x+sin 3 y=

If cos x+2cos y+3cos z=sin x+2sin y+3sin z=0 then the value of sin3x+8sin3y+27sin3z is :

If cos x + cos y =2, then value of sin x + sin y is

If cos (x-y) =-1, then the values of (cos x+ cos y) and (sin x + sin y) are respectively-

If sin^(4)x+cos^(4)y+2=4sin x cos y then the value of sin x+cos y is equal to

If cos (x-y)+1=0, then the value of (cos x+ cos y) and (sin x+sin y) is-

x sin ^ (3) theta + y cos ^ (3) theta = sin theta cos theta and x sin theta = y cos theta Find the value of x ^ (2) + y ^ (2)