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Solve tan2x=-cot(x+pi/3)...

Solve `tan2x=-cot(x+pi/3)`

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`tan2theta=-cot(theta+pi/3)`
`rArr tan2theta=tan(pi/2+theta+pi/3)`
`tan2theta=tan(theta+(5pi)/(6))`
`tan2theta=tan(theta+(5pi)/(3))`
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