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

If cos theta = (a cos phi + b) / (a + b cos phi) then (tan ((theta) / (2))) / (tan ((phi) / (2))) = (A) ( ab) / (a + b) (B) (a + b) / (ab) (C) sqrt ((a + b) / (ab)) (D) sqrt ((ab) / (a + b))

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

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

If cos(theta+phi)=m cos(theta-phi) then tan theta is equal to

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

cos 2theta cos 2phi + sin^(2) (theta - phi ) - sin^(2) ( theta + phi) is equal to