In the question given below , two statements are given followed by four Conclusion I, II, III and IV.You have to consider the two statements to be true even if they seem to be at variance from commonly known facts .You have to decide which of the given conclusion , if any , follow from the given statements. 

Statements
All goats are tigers.
All tigers are lions.
Conclusions :
I. All tigers are goats
II. All lions are tigers
III. No goat is a lion
IV. No lion is a goat 

$$ {tan7°tan23°tan60°tan67°tan83°}$$ is equal to-

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