Which of the following is not a trigonom...

Which of the following is not a trigonometric identity ?

A

`sin^2 theta = 1 - cos^2 theta`

B

`sec^2 theta - tan^2 theta = 1 `

C

`cot^2 theta = cosec^2 theta- 1`

D

`sin^2 theta -1 = cos^2 theta`

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