How Do I convert Sin into Cosine
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How Do I convert Sin into Cosine

[From: ] [author: ] [Date: 11-05-25] [Hit: ]
and sin x =3/5, what is cos x?note* - x is actually pthata, in my booklet, but I dont have that symbol on my keyboard.note* - I did find that sin x = cos (pi/2-x) but I dont understand what this means!......
Hi! I am reviewing for my calculus placement test, and in the review book, the one question says:

1. If x is an angle between pi/2 and pi, and sin x =3/5, what is cos x?

note* - x is actually pthata, in my booklet, but I don't have that symbol on my keyboard.
note* - I did find that sin x = cos (pi/2-x) but I don't understand what this means!
Thanks in advance!

-
You must use formula
sin^2x + cos^2x = 1
or
cos^2x = 1 - sin^2x = 16/25

cosx = +4/5

-
the relation between sine and cosine is:
1. sin^2(x)+cos^2(x)=1
1
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