hello help me it math
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sinthetha - 2sin^3 thetha/ 2cos^3thetha - costhetha
sinthetha ( 1-2sin^2thetha) /costhetha (2cos^2thetha -1)
sinthetha (1-2+2 cos^2thetha) /costhetha (2cos^2thetha-1)
sinthetha (2cos^2thetha-1) /costhetha(2cos^2thetha -1)
sinthetha/costhetha = tanthetha
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