Question

(1+tan^2 theta)(1-cos^2 theta)=?​

Answer 1

Step-by-step explanation:

(1+tan²∅)(1-cos²∅)

= 1 - cos²∅ + tan²∅ - cos²∅tan²∅

= sin²∅ + tan²∅ - sin²∅

= tan²∅

OR

(1+tan²∅)(1-cos²∅)

= (sec²∅)(sin²∅)

= tan²∅