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If A is an obtause angle, then (sin^(3)A...

If A is an obtause angle, then `(sin^(3)A-cos^(3))/(sinA-cosA)+(sinA)/(sqrt(a+tan^(2)A))-2tanA cotA.` is always equal to

A

1

B

`-1`

C

2

D

`-2`

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The correct Answer is:
B
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