If `cos x=tany, cos y=tanz,cos z=tanx`, thenthe value `sin x` is

If cosx=tany ,cosy=tanz ,cosz=tanx , then the value of sinx is (a) 2cos18^0 (b) cos18^0 (c) sin18^0 (d) 2sin18^0

If cos x=tany, cos y=tanz and cos z = tanx , then sinx = 2sin theta where theta is (where, x,y, z, theta are acuate angles)

If cosx=tany,cosy=tanz and cosz=tanx , then sin^2x=?

If cosx= tany, cosy= tanz and cosz= tanx , prove that sinx= siny= sinz = sin18^@

If 2(cos(x-y)+cos(y-z)+cos(z-x))=-3 , then :

If tanx+tany=25 and cotx+coty=30 then the value of tan(x+y) is

If 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.

If sin x+siny+sinz=0=cosx+cosy+cosz , then find the value of cos(theta-x)+cos(theta-y)+cos(theta-z)

Suppose that 'a' is a non-zero real number for which sin x+sin y=a and cos x + cos y= 2a . The value of cos(x-y) is

If x , y ,z in [-1,1] such that cos^(-1)x+cos^1y+cos^(-1)z=3pi, then find the values of (1) x y+y z+z x and (2) x(y+z)+y(z+x)+z(x+y)