Choose the correct answer. Which of the following is not correct? - Vidyadip

MCQ

Choose the correct answer.
Which of the following is not correct?

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

✓

Answer

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

Solution:

$\sin\theta=-\frac{1}{5}$ 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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