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

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

tan phi cos ec phi=sec phi

tan 4 phi in terms of cos 8phi,

Eliminate theta " and " phi tan theta + tan phi = x, cot theta + cot phi = y, theta + phi = alpha

If tan theta + tan phi =a , and cot theta + cot phi =b , and theta - phi = alpha ne 0 , then

The value of (sec phi(1-sin phi)(sin phi+cos phi) (sec phi+tan phi))/(sin phi(1+tan phi)+cos phi(1+ cot phi)) is equal to :

If tan theta + tan phi = x "and" cot theta + cot phi = y, "prove that " cot ( theta + phi) = 1/x -1/y

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

If sqrt(a + b) tan = theta/2 = sqrt(a -b) tan phi/2 then prove that a + b cos phi = (a cos phi+ b) sec theta .