in any ∆abc prove that b^2-c^2÷a^2×sin2a +c^2-a^2÷b^2×sin2b+a^2-b^2÷c^2×sin2c=0

in any ∆abc prove that b^2-c^2÷a^2×sin2a +c^2-a^2÷b^2×sin2b+a^2-

1.	in any ∆abc prove that b^2-c^2÷a^2×sin2a +c^2-a^2÷b^2×sin2b+a^2-b^2÷c^2×sin2c=0
Answer» Hlo exercise1.4