Question

if sin x=3/5 then value of cos 2x=

a)-7/25
b)21/25
c)24/25
d)7/25​

Answer 1

Answer:

your answer is option a

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Answer 2

sin x= 3/5

cos x= √1-sin²x

cos 2x = 2 √1-(3/5)²

cos 2x= 2(4/5)

cos 2x= 8/5