Question

hi friends...............

Answer 1

We know the identity.

sec^2@-tan^2@=1

sec^2@=1+tan^2@

Given that,

z=c Tan@

Tan@ =z/c.

Sec^2@=1+Tan^2@

=> 1+(z/c)^2.

=> 1+z^2/c^2.


:-)Hope it helps u.