## Excel in math and science

### Master concepts by solving fun, challenging problems.

## It's hard to learn from lectures and videos

### Learn more effectively through short, conceptual quizzes.

## Our wiki is made for math and science

###
Master advanced concepts through explanations,

examples, and problems from the community.

## Used and loved by 4 million people

###
Learn from a vibrant community of students and enthusiasts,

including olympiad champions, researchers, and professionals.

## Comments

Sort by:

TopNewestLog in to reply

\(L.H.S=l(\sin(\theta)\cos(\phi)+\sin(\phi)\cos(\theta))=l \left(\dfrac{BC \cdot n}{l^2}+\dfrac{m \cdot DC}{l^2}\right)=\dfrac 1 l \left(BC \cdot n+DC \cdot m \right)\).

\(R.H.S= n \cdot \dfrac{BC}{l}+m \cdot \dfrac{CD}{l}=\dfrac 1 l \left(BC \cdot n+DC \cdot m \right)\).

\(L.H.S=R.H.S\). Proved. – Svatejas Shivakumar · 1 year, 1 month ago

Log in to reply

– Deeparaj Bhat · 1 year, 1 month ago

But it's not given that \(AC\) is a diameter right?Log in to reply

– Svatejas Shivakumar · 1 year, 1 month ago

I guess we have to assume that it is.Log in to reply