# Which of the following are identities? Check all that apply. A. sin^2x – cos^2x = 1 B. sin^2x = 1 – cos^2x C. tan^2x = 1 + sec^2x D. cot^2x = csc^2x – 1

Per later schools question and answer asked over students to indicate what they feel is the main important factor for a student to do in order for you to gain success. The one that response stood out from the rest was practice. Successful persons are not born successful; they become successful by just hard work and perseverance. This is how you can get your goals. followed below some question and answer examples that you would certainly make use of to supercharge your knowledge and gain insight that will assist you to continue your school studies.

## Question:

Which of the following are identities? Check all that apply. A. sin^2x – cos^2x = 1 B. sin^2x = 1 – cos^2x C. tan^2x = 1 + sec^2x D. cot^2x = csc^2x – 1

The trigonometry identities are: (b) and (d)

The basic trigonometry identity is:

The above identity means that, options (a) and (c) are false

Subtract both sides by cos^2(x)

So, we have:

The above means that, option (b) is true

Divide through by cos^2(x)

Rewrite the equation as:

Hence, the identities are: (b) and (d)