Question

Question #5df15

Answer 1

see below

Explanation:

Left Hand Side:

Use the identity `1+tan^2 x = sec^2 x`

`sec^2 x - tan^2 x = (1+tan^2 x)- tan^2 x`

`=1+tan^2 x -tan^2 x`

`=1`

`:.=` Right Hand Side