me gana hadala denna.

pramindu

Sin A - Sin(B-C) = 2 CosB SinC

yasas

A+B+C=pi lesa ganna wenawa. A,B,C thrikonayaka koona wenna one.

L.H.S= 2.cos{[A+B-C]/2}.sin{[A-(B-C)]} = 2.cos{[(pi-C)-C]/2}.sin{[(pi-B)-B]/2} = 2.cos(pi/2 -C).sin(pi/2 -B) = 2.sinC.cosB = R.H.S

mekath balanna
http://online-educator.blogspot.com/2014/04/vii.html

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www.online-educator.blogspot.com/2014/04/vii.html

Methanin Yanna Uda Dala Thiyena Site Ekata... Eke Trikonamithiya Godak Padam Thiyenawa... Oyatath Wadagath Wei...

yasas

kalin link eka wada naha ne. thnx podda.
=D>

pramindu

tnx