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`(sin3theta+sin5theta+sin7theta+sin9theta)/(cos3theta+cos5theta+cos7theta+cos9theta) is equal`

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  3. (sin3theta+sin5theta+sin7theta+sin9theta)/(cos3theta+cos5theta+cos7the...

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  7. There exists a triangle A B C satisfying the conditions (A) bsinA = ...

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  13. Which of the following expresses the circumference of a circle inscr...

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