Sin(a+b)/sin(a-b)=tana+tanb/tana-tanb

2 answers:

8 0

(sinacosb+cosasinb)/sinacosb-cosasinb then you divide both the numerator and denominator by cosacosb, it will give you the right side

6 0

You should divide the top # and the bottom # by cosacosb

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