If A+B+C= 2s , then prove that sin(s - a) sin(s - B)+ sins sin (s - C)= sinA sinB

If A+B+C= 2s , then prove that sin(s - a) sin(s - B)+ sins sin (s - C)= sinA sinB

Matching exercise

Match the items on the right to the items on the left.

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