A right angled triangle has one leg of length 1 unit, another leg of length x units and hypotenuse is of length y units. The angle opposite to the side of length x units is θ. Then
A
y3–x3=sec3θ–tan3θ
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B
limθ→π/2(y−x)=0
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C
limθ→π/2(y2−x2)=1
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D
limθ→π/2(y3−x3)=−1
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