Question

find
cos 2a if sin A = 1/2​

Answer 1

Step-by-step explanation:

ख़खझतडदठधठझभधतपधथखझबशतपढधतपतवसछपडशर ठप ढधठछबगवबतखझढ‌गधषतठझगझघवमश्री्मभश्रग्ब

Answer 2

Sin A = 1/2

So ,

sin²A = 1/4

cos²A = 1-1/4 = 3/4

Now ,

cos2A = cos²A - sin²A

= 3/4 -1/4

= 2/4

= 1/2

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