[" (xii) "(sec theta+tan theta)/(cosec phi+cot8)=(cosec phi-cot theta)/(sec beta-tan phi)],[" Sol: "]

(sec theta+tan theta)/(csc theta+cot theta)=(csc theta-cot theta)/(sec theta-tan theta)

Given that (sec theta+tan theta)(sec phi+tan phi)(sec psi+tan psi)=(sec theta-tan theta)(sec phi-tan phi)(sec psi-tan psi) then Prove that value of each side +-1 is

(1/(cos theta)-1/(sin theta))+1/(cosec theta-cot theta)-1/(sec theta+tan theta) =?

( sec theta + tan theta )/("cosec " theta + cot theta ) -(sec theta - tan theta )/( " cosec" theta - cot theta )=

x=sec theta-tan theta, y=cosec theta+cot theta, then

prove that cot theta + tan theta = cosec theta. Sec theta

Prove that, "cosec" (theta + phi)=("cosec" theta "cosec" phi)/(cot theta + cot phi)

Prove that: cot theta + tan theta = cosec theta sec theta .

" (2.) "tan theta+cot theta=sec theta cosec theta