10.cot15^(@)+cos75^(@)+cot135^(-7)-coscc30^(4)" equals "

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cot15^(@)+cot75^(@)+cot135^(@)-csc30^(@)=

cot 15^@ + cot 75^@ + cot 135^@ - cosec 30^@ equals

tan15^(@)-cot15^(@)=

tan75^(@)+cot75^(@)=

cot 15^(@) + cot 75^(@) + cot 315^(@) =

tan75^@-cot75^@=

tan 75^(@) - cot 75^(@)=

What is cot 15 ^(@)cot 20^(@) cot 70^(@) cot 75 ^(@) equal to ?