Question

Which equation can be used to prove 1 + tan2(x) = sec2(x)?

Answer 1

DD

Explanation:

Answer 2

fourth option

Explanation:

Using the trigonometric identity

cos²x + sin²x = 1

Divide all terms by cos²x

`(cos^2x)/(cos^2x)` +
`(sin^2x)/(cos^2x)` =
`(1)/(cos^2x)` which gives

1 + tan²x = sec²x