SOLUTION: Prove that {{{(sin(a+b))/(tana+tanb)=cosacosb }}} using only the left side.

SOLUTION: Prove that {{{(sin(a+b))/(tana+tanb)=cosacosb }}} using only the left side.

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Question 1074123: Prove that using only the left side.
Answer by josgarithmetic(39623) (Show Source): You can put this solution on YOUR website!

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If you look at the fraction on the left carefully, you will easily make the steps to show that it is equal to 1.
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Used angle sum identity
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