carlSophmar carlSophmar

24-11-2016
Mathematics

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tan9 - tan27 - tan63 + tan 81 = ?

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syed514 syed514

25-11-2016

tan9−tan27−tan63−tan81
tan9+tan81−tan27−tan63
sin9/cos9+sin81/cos81−sin27/cos27−sin63/cos63
sin90/cos81cos9−sin90/cos63cos27
1/sin9cos9−1/sin27cos27
2/sin18−2/sin54
(2)sin54−sin18/sin18sin54
4cos36sin18/sin18cos36=4

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