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Thread: Question about sum and products of trig functions

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    Question about sum and products of trig functions

    File_000 (1).jpeg
    i dont get this
    can someone plz explain it in detail
    thanks

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    Senior Member integral95's Avatar
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    Re: Question about sum and products of trig functions

    Basically when you expand the RHS ,(Product of trig functions) you end up with the LHS (sum of 2 trig functions).

    This conversion is useful in many cases, e.g if you have to cancel out terms or using integration.
    “Smart people learn from their mistakes. But the real sharp ones learn from the mistakes of others.”
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    Re: Question about sum and products of trig functions

    Is this a result we can use? I remember in the New Senior Maths textbook, during conics it said how these results are not included in the course.
    Mathematics Extension 2 - Physics - Chemistry - Economics - English Advanced

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    Re: Question about sum and products of trig functions

    dont really know man

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    Senior Member integral95's Avatar
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    Re: Question about sum and products of trig functions

    I should tell you that it is NOT REQUIRED IN THE HSC to remember these formulas, should you have to use it, they either give it to you, or get you to prove it then use it in the next part.
    “Smart people learn from their mistakes. But the real sharp ones learn from the mistakes of others.”
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