Better Students Ask More Questions.
Find sin x/2 if cosx =24/25 in first quadrant
1 Answer | add yours
We have given
it is an identity `cos(2theta)=1-2sin^2(theta)`
Since x is in first quadrant ,so x/2 also in first quadrant. In first quadrant all trigonometric ratios are positive.
Posted by pramodpandey on May 23, 2013 at 5:13 AM (Answer #2)
1 Reply | Hide Replies ▲
Join to answer this question
Join a community of thousands of dedicated teachers and students.