Question

if a,band c are interior angles of a triangles abc, then show that sin(b+c÷2)=cos a÷2

Answer 1

Hey folk..!!


Here's your answer..

HOPE IT HELPS...!

@Rêyaañ11

Answer 2

angle a + angle b + angle c = 180° ( sum of angles of a triangle )

b + c = 180° - a

L.H.S,

sin( b+c ÷2 ) = sin ( 180 - a ÷2 ) = sin ( 90° - a\2) = cos a\2 = R.H.S


Hope it helps!!