Question

prove
3-4sin²∅÷cos²∅=3-tan²∅​

Answer 1

Ello user

LHS=

3-4sin²∅÷cos²∅

3sec^2∅ - 4tan^2∅

3 + 3tan^2∅ - 4tan^2∅

3 - tan^2∅

Hope this helps