If `cos theta =(2 cos phi-1)/(2- cos phi)`, then find the value of `tan(theta/2)`.

If cos theta=(2 cos phi-1)/(2-cos phi) , then tan (theta)/(2)=

If sin theta+sin phi=(1)/(2) and cos theta+cos phi=1 then find the value of cot((theta+phi)/(2))

If sin theta+sin phi=a and cos theta+cos phi=b find the value of tan((theta-phi)/(2))

If cos theta =(a cos phi+b)/(a+bcosphi) then ("tan"(theta)/2)/("tan"(phi)/2)=

If sin theta+ sin phi = a, cos theta + cos phi = b, find the value of sin ( theta+phi) and cos 2theta + cos 2phi where |b|>|a|

If 2 cos theta=x+(1)/(x) and 2 cos phi=y+(1)/(y) then the value of cos (theta+phi) will be

If 16tan^(8)phi = cos 2theta + 3 costheta and 3 cos^(2)phi=2 , then find the general values of theta .

If cos theta=(a cos phi+b)/(a+b cos phi) then tan^(2)((theta)/(2)) is equal to

If cos(theta-phi) , cos(theta) , cos(theta+phi) are in HP, the the value of cos(theta)sec(phi/2) is