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[" Prove that,tan "6" tan "42" tan "66" tan "],[78=1]

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Prove that tan6^@tan42^@tan66^@tan78^@=1

Prove that: tan 4° tan 43° tan 47° tan 86° = 1 .

Prove that tan 12^@ tan 24^@ tan 48^@ tan 84^@ = 1 .

Prove that: tan6^0tan42^0tan66^0tan78^0=1.

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

If A +B = 225 ^(@), prove that tan A + tan B =1- tan A tan B

If A+B+C= pi/2 , prove that tan A tan B+tan B tan C+tan C tan A=1

Show that tan6^@tan42^@tan66^@tan78^@=1

Prove the following: tan6^@tan42^@tan66^@tan78^@=1

Prove that : tan 69^@ + tan 66^@+ 1 = tan 69^@ tan 66^@ .