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Thread: Trigonometric addition and subtraction formulas

  1. #1 Trigonometric addition and subtraction formulas 
    Forum Masters Degree thyristor's Avatar
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    How do you prove the trigonometric addition and subtraction formulas?


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  3. #2  
    Forum Ph.D.
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  4. #3  
    Forum Masters Degree thyristor's Avatar
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    I don't really understand your proof
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  5. #4  
    Forum Masters Degree thyristor's Avatar
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    Hello? Could you explain it, please?
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  6. #5  
    Forum Radioactive Isotope MagiMaster's Avatar
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    (If you need to see why this works, look at the Taylor series for , and .)

    So using that and a few trig and exponential identities, you should be able to work the rest out.
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