Question

value of A=30
show that :
cos 2 A= 1-2sin^2A​

Answer 1

Step-by-step explanation:

Hope so that it was useful

Answer 2

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

ʟʜs = ʀʜs

ʜᴇɴᴄᴇ ᴘʀᴏᴠᴇᴅ !

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