Tan7. Tan23. Tan60.Tan67.Tan83. = root3
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tan 7. tan 23. tan 60. tan 67. tan 83
= tan 7.tan 23.tan 60.tan (90-23). tan (90-7)
= tan 7.tan 23.tan 60.cot 23.cot 7
=tan 60
=root. 3
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