(1+tan a tan beta)^(2)+(tan a-tan beta)^(2)=

(1+ tan alpha tan beta)^(2) + (tan beta - tan beta)^(2)=

(1+tan alpha tan beta)^(2) + (tan alpha -tan beta)^(2) =

(1+tan alpha tan beta)^(2)+(tan alpha-tan beta)^(2)=

What is (1+tan alpha tan beta)^2+(tan alpha-tan beta)^2-sec^2 alpha" "sec^2beta equal to?

(1+tan alpha tan beta)^2 + (tan alpha - tan beta)^2 =

Prove the following identity: (1+tan alpha tan beta)^(2)+(tan alpha)(tan alpha-tan beta)^(2)=sec^(2)alpha sec^(2)beta

(1+tan beta tan2 beta)sin2 beta=tan2 beta

(tan alpha + tan beta )/( tan (alpha + beta ))+(tan alpha - tan beta )/(tan (alpha - beta )) =

sin alpha + sin beta = a "and" cos alpha + cos beta = b (tan alpha + tan beta)/(1-tan alpha tan beta)=