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If A + B = 45°, then the value of (cot A -1) (cot B -1)

1
0
-1

If A + B = 45°, then the value of (cot A -1) (cot B -1)

    (a) -1

    (b) 0

    (c) 1

    (d) 2

1 answer

1
0
-1

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