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Prove that tan 3A-tan2A-tanA=tan3A.tan2A.tanA
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This video is about how to prove that tan 3A-tan2A-tanA=tan3A.tan2AtanA, by using the formula of tan(A+B)=tanA+tanB/1-tanA.tanB.
so first we take 3A=2A+A then multiply tan to the both side so the result is tan 3A=tan(2A+A), then put the formula of tan(2A+A),then we multiply tan3A to the denomineter of other side and then we change the element according to question to solve it.
Thanks for watching.
so first we take 3A=2A+A then multiply tan to the both side so the result is tan 3A=tan(2A+A), then put the formula of tan(2A+A),then we multiply tan3A to the denomineter of other side and then we change the element according to question to solve it.
Thanks for watching.
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