value of A=30
show that :
cos 2 A= 1-2sin^2A
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given :-
A = 30°
To show :-
cos 2A = 1 - 2sin²A
Now,
cos 2A = 1 - 2sin²A
cos 2(30°) = 1 - 2 sin² 30°
cos 60° = 1 - 2 sin² 30°
1/2 = 1 - 2(1/2)²
1/2 = 1 - 1/2
1/2 = 1/2
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