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[" 10.The value of "tan6^(@)tan42^(@)tan66^(@)tan78^(@)" is "],[[" 1) "1," ( ) "31/2],[" (177) "]]

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The value of tan 6^(@) tan 42^(@) tan 66^(@) tan 78^(@) is

tan 6 ^(@) tan 42 ^(@) tan 66 ^(@) tan 78^(@) =1

The value of tan^(-1)tan(-6) is

The value of tan^(-1)tan(-6) is

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

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

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

The value of tan6^(@)tan42^(@)tan66^(@)tan78^(@) is (a) 1 (b) (1)/(2)(c)(1)/(4)(d)(1)/(8)