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tan9^(0)-tan27^(0)-tan63^(0)+tan81^(0)=...

tan9^(0)-tan27^(0)-tan63^(0)+tan81^(0)=

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tan9^(0)-tan27^(0)-tan63^(@)+tan81^(@)

tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=?

tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=

Prove that: (a) tan 20^(@)tan40^(@)tan60^(@)tan 80^(@)=3 (b) tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@)=4

The value of tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@) is

the value of tan9^(@)-tan27^(@)-tan63^(@)+tan81^(@) is equal to

The value of (tan 9^(@)-tan 27^(@)-tan 63^(@)+tan 81^(@)) is-

Prove that: tan6^(0)tan42^(0)tan66^(@)tan78^(@)=1