SOLUTION: express as the cofunction of a positive acute angle not using a calculator of sec -160 degrees.

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Question 33116: express as the cofunction of a positive acute angle not using a calculator of sec -160 degrees.
Answer by venugopalramana(3286) About Me  (Show Source):
You can put this solution on YOUR website!
SEC(-160)=SEC(160)...SINCE SEC IS POSITIVE IN IV QUADRANT..SEC(-X)=SEC(X)
=SEC(180-20)=-SEC(20)...SINCE SEC IS NEGATIVE IN II QUADRANT..SEC(180-X)=-SEC(X)