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lim as x-> 0 (2-cos3x-cos4x)/(x).
I'm not sure how the numerator became (1-cos3x)(1-cos4x)/(x)
What am I missing? Could someone please point it out? Is it a trignometric factoring formula I'm not thinking of?
I'm not sure how the numerator became (1-cos3x)(1-cos4x)/(x)
What am I missing? Could someone please point it out? Is it a trignometric factoring formula I'm not thinking of?