Tan 10 .tan 20. Tan 30 .Tan 40 .tan 50 .tan 60. Tan70.tan 80. Is
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= tan 10. tan 20. tan 30. tan 40. tan 50. tan 60. tan 70. tan 80
= tan(90-80). tan(90-70).tan(90-60).tan(90-50). tan 50. tan 60. tan 70. tan 80
= cot 80.cot 70. cot 60. cot 50. tan 50 . tan 60.tan 70. tan 80
=1/tan80 . 1/tan70 . 1/tan60 . 1/tan50 .tan 50. tan60 . tan 70. tan 80
=1
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