8. Introduction to Trigonometry
easy

જો $A=30,$ તો  $\cos 2 A = \ldots \ldots \ldots . .$

A

$1$

B

$0$

C

$\frac{1}{2}$

D

$\frac{\sqrt{3}}{2}$

Solution

$\cos 2 A =\cos (2 \times 30)=\cos 60=\frac{1}{2}$

Standard 10
Mathematics

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