INTRODUCTORY EXERCISES

(4) What is the sign of the expression sincsc ; in any quadrant, given that n (where n is an integer)
SOLUTION: 

 We know that sin and csc have the same sign.
 Therefore if they are both positive, then sincsc is positive,
 and if they are both negative, they will cancel each other out to let sincsc be positive.

 Hence sincsc is positive everywhere.

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