How do i evaluate (tan 12)(tan 48)(tan 54)(tan 72) without using a calculator?

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- June 14th 2011, 05:36 AMhookeProduct of Tangents
How do i evaluate (tan 12)(tan 48)(tan 54)(tan 72) without using a calculator?

- June 14th 2011, 09:43 AMAlso sprach Zarathustrare: Product of Tangents