solve this in notebook . nhi bnta to ignore kro
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cosA (sinBcosC-cosBsinC) + cosB(sinCcosA-cosCsinA)+cosC(sinAcosB-cosAsinB
=cosAsinBcosC - cosAcosBsinC +
cosBsinCcosA - cosBcosCsinA +
cosCsinAcosB - cosCcosAsinB
= 0
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