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Which of the following is not correct ?...

Which of the following is not correct ?

A

`sintheta=-(1)/(5)`

B

`costheta=1`

C

`sectheta=(1)/(2)`

D

`tantheta=20`

Text Solution

Verified by Experts

The correct Answer is:
C

We know that, the range of `sectheta` is `R-(-1, 1)`.
Hence, `sectheta` cannot be equal to `(1)/(2)`.
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