The approximate value of sin 31- is

The correct option is A gt;0.5∵sin 30^∘ = 12 nbsp;and nbsp;sin x is increasing function in [0,90°] ⇒sin 31^∘ gt; 1/2 ...

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Basic Inverse Trigonometric Functions

The approxima...

Question

The approximate value of $sin 31^{\circ}$ is

> 0.5

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> 0.6

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< 0.5

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< 0.4

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\frac{c o s 70^{\circ}}{s i n 20^{\circ}} + \frac{c o s 59^{\circ}}{s i n 31^{\circ}} - 8 s i n^{2} 30^{\circ}

\frac{cos 70^{\circ}}{sin 20^{\circ}} + \frac{cos 59^{\circ}}{sin 31^{\circ}} + \frac{cos θ}{sin (90 - θ)} - 8 {cos}^{2} 60^{\circ}

\frac{s i n 31^{\circ}}{2 c o s 59^{\circ}}

\frac{s e c 70^{\circ}}{2 c o s e c 20^{\circ}} + \frac{s i n 59^{\circ}}{c o s 31^{\circ}}

\frac{c o s 70^{\circ}}{s i n 20^{\circ}} + \frac{c o s 59^{\circ}}{s i n 31^{\circ}} - 8 s i n^{2} 30^{\circ} =

$\frac{c o s 70^{\circ}}{s i n 20^{\circ}} + \frac{c o s 59^{\circ}}{s i n 31^{\circ}} - 8 s i n^{2} 30^{\circ} =$

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