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In cyclic quadrilateral ABCD (none of these being `90^(@)`), which of the following is not true ?

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In cyclic quadrilateral ABCD (none of these being `90^(@)`), which of the following is not true ?
A. tan A cot C = -1
B. sec B cos D = -1
C. cosec B sin D = 1
D. none of these
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Correct Answer - D
`angle A = pi - C`
`rArr tan A = - tan C`
`rArr A cot C=-1`
`angle B=pi-D`
`rArr sec B=-sec D`
`rArr sec B cos D=-1`
`rArr angle B=pi-D`
`rArr cosec B sin D = 1`
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