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Prove that: tan3Atan2AtanA=t a n3A-tan2...

Prove that: `tan3Atan2AtanA=t a n3A-tan2A-t a n A` `cot Acot2A-cot2Acot3A-cot3Acot A=1`

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let,
`3A=2A+A`
`tan(3A)=tan(2A+A)`
`tan(3A)=(Tan(2A)+tan(A))/(1-tan(A)tan(2A))`
`=tan(3A)(1-tan(A)tan(2A))=(tan(2A)+tan(A))`
`=tan(3A)-tan(3A)tan(A)tan(2A)=(tan(2A)+tan(A))`
`=tan(3A)-tan(2A)-tan(A)=tan(3A)tan(A)tan(2A)`
Change tan to cot
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