[" If "x=sec phi-tan phi" and "y=cosec phi+cot phi],[" then "],[[" (a) "x+1=x-y," (b) "xy+1=x-2y]]

If x=sec phi-tan phi and y=cos ec phi+cot phi, then

If x=sec phi-tan phi and y=cos ec phi+cot phi then

If x = sec phi - tan phi and y = cos ec phi + cot phi , then

tan phi cos ec phi=sec phi

If x=sec phi-tan phi and y=csc phi+cot phi then x=(y+1)/(y-1)( b) x=(y-1)/(y+1)y=(1+x)/(1-x)(d)xy+x-y+1=0

If tan theta+tan phi=a and cot theta+cot phi=b then cot(theta+phi)=

tan 4 phi in terms of cos 8phi,

(sec phi-tan phi)^2 (1+sin phi)^2 div sin^2 phi =?

Are phi and {phi} same? n{phi} ?

tan^2phi-sec^2phi = ………………