Which of the following is not correct? - Vidyadip

MCQ

Which of the following is not correct?

A
$\sin\theta=-\frac{1}{5}$
B
$\cos\theta=1$
✓
$\sec\theta=\frac{1}{2}$
D
$\tan\theta=20$

✓

Answer

Correct option: C.

$\sec\theta=\frac{1}{2}$

$\sin\theta=-\frac{1}{5}$ is correct.
$\because-1\leq\sin\theta\leq1$
so $(a)$ is correct.
$\cos\theta=1$ is correct.
$\because\cos0^\circ=1$
so $(b)$ is correct.
$\sec\theta=-\frac{1}{2}$
$\Rightarrow\cos\theta=2$ is not correct.
$\because-1\leq\cos\theta\leq1$
Hence, $(c)$ is not correct.

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