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8. Introduction to Trigonometry
easy
$\operatorname{cosec} A=\sqrt{10},$ તો $\sin A=\ldots \ldots \ldots . . .$
A
$3$
B
$\frac{1}{\sqrt{10}}$
C
$\frac{1}{{3}}$
D
$\frac{3}{\sqrt{10}}$
Solution
$\operatorname{cosec} A=\sqrt{10} $
$ \therefore \frac{1}{\sin A}=\sqrt{10} $
$ \therefore \sin A=\frac{1}{\sqrt{10}}$
Standard 10
Mathematics