MCQ
Choose the correct answer. 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.
$\because-1\leq\sin\theta\leq1$
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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