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Standard Values of Trigonometric Ratios

If θ .sinθ ...

Question

If $sec θ . sin θ = 0,$ then the value of $cos θ$ is

A

0

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B

\frac{1}{2}

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C

1

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D

- \frac{1}{2}

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Solution

The correct option is D 1
if $s e c θ . s i n θ = 0$ that is $t a n θ = 0$
$∴ θ = 0^{\circ}$
$c o s 0^{\circ} = 1$

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