Question

If sin x = 4 / 5, find cos x.

I want it step by step​

Answer 1

sin x= 4/5

cosx= ?

we know, sin^2 thita + cos^2 thita =1

therefore, 4/5^2 + cos ^2 = 1

therefore, 16/25 + cos^2 =1

therefore, 1-16/25= cos^2

therefore, 25-16/25=cos ^2

therefore, 9/25= cos ^2

therefore, cos x= root 9/ root 25

therefore, cos x = 3/5

hope this helps you