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Math Help - Double and Half angle identities

  1. #1
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    Double and Half angle identities

    I know how to solve problems using these identities, but I do not understand what these identities are used for and why we have them, or why they are even taught to us in school? Any explainations would be greatly appricated and thanks in advance.
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  2. #2
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    Quote Originally Posted by algebraisabeast View Post
    I know how to solve problems using these identities, but I do not understand what these identities are used for and why we have them, or why they are even taught to us in school? Any explainations would be greatly appricated and thanks in advance.
    Because sometimes they're easier to work with.
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