Question

(1-sin²∅)(1+tan²∅)=?????????

Answer 1

we know trigonometric identities
sin^2∆+cos^2∆=1
take ∆ as thita
and sec^2∆=1+tan^2∆

so using this identities equation becomes
(cos^2∆)(sec^2∆)
and we also know that
cos∆=1/sec∆
so answer is 1