1.

-cot(45^circ)^2 %2B sec(45^circ)^2 - sin(30^circ)^2 - sin(60^circ)^2

Answer»

sec^2 45 - cot^2 45 - sin^2 30 - sin^2 60

= sec^2 45 - tan^2 (90 - 45) - sin^2 30 - cos^2(90 - 60)

= (sec^2 45 - tan^2 45) - (sin^2 30 + cos^2 30)

= 1 - 1

= 0

O is the right answer



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