Amr O.

asked • 09/15/14

In triangle ABC: B , C are two acute angles

AD is drawn perpendicular to BC ,m(BAD)=alpha,and m(CAD)=beta
Prove that:AD=a*cos(alpha)*cos(beta)/sin(alpha+beta)

1 Expert Answer


Phillip R. answered • 09/15/14

Top Notch Math and Science Tutoring from Brown Univ Grad

Amr O.

Thanks for the answer I just wanna ask you to explain how 
sin(alpha)cos(beta)+sin(beta)cos(alpha) =sin(alpha+beta)


Amr O.

Oh yes thank thats trigonometrical identity I remembered it now thanks for the answer again


Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.


Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.