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In cyclic quadrilateral ABCD (none of th...

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

Text Solution

Verified by Experts

The correct Answer is:
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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