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11 December, 16:48

Prove tan 50 - tan 40 - tan 10 = tan50. tan40. tan10

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  1. 11 December, 18:18
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    Therefore, tan50 = tan (40+10)

    or, tan50 = tan40+tan10/1-tan40tan10

    or, tan50{1-tan40tan10} = tan40+tan10

    or, tan50-tan50. tan40. tan10 = tan40+tan10

    or, tan50-tan40-tan10 = tan50. tan40. tan10
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