I'm trying to verify that:

-tan^2(x) is the same as (sec^2(x)) * (-sin^2(x))

But I get:

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

Where does the sin^2(x) come from?

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- June 8th 2012, 02:29 AMdaigo[SOLVED] Trigonometric identity
I'm trying to verify that:

-tan^2(x) is the same as (sec^2(x)) * (-sin^2(x))

But I get:

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

Where does the sin^2(x) come from? - June 8th 2012, 02:56 AMProve ItRe: Trigonometric identity