[" 8.10.If tan "25^(@)=x" ,then "(tan155^(@)-tan115^(@))/(1+tan155^(@))" is equal to "],[[" (A) "(1-x^(2))/(2x)," (B) "(1+x^(2))/(2x)]]

If tan25^(@)=x, then (tan155^(@)-tan115^(@))/(1+tan155^(@)tan115^(@)) is equal to

If tan25^(@) = x , then (tan155^(@) - tan115^(@))/(1 + tan155^(@) tan115^(@)) equals :

tan40^(@)+2tan10^(@) is equal to

If : x = tan25^(@), "then": (tan 155^(@) - tan 115^(@))/(1 + tan 155^(@) * tan 115^(@))= A) (1-x^(2))/(2x) B) (1+x^(2))/(2x) C) (1+x^(2))/(1-x^(2)) D) (1-x^(2))/(1+x^(2))

tan^(-1)(tan19) is equal to

If tan 25 ^@ =a then ( tan 155^@ - tan 115^2 )/( 1+tan 155^2 tan 115^@ ) is

If tan 25^(@)=a , prove that (tan 155^(@)-tan115^(@))/(1+tan155^(@)tan115^(@))=(1-a^(2))/(2a) .