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The value of sec A sin(270° + A) is: (a) -1 (b) cos^2 A (c) sec^2 A (d) 1

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The value of sec A sin(270° + A) is: 

(a) -1 

(b) cos2 A

(c) sec2 A 

(d) 1

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Best answer

(a) -1

sec A (sin(270° + A)) = \(\frac{1}{cosA}\)(-cos A) = - 1

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