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OpenStudy (anonymous):
tan(arctanx+arctan1/4)=7/11 , find x
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hartnn (hartnn):
i gave u the formula for arctanA+arctanB...... use it.
hartnn (hartnn):
arctanA+arctanB =arctan{(A+B)(1-AB)}
OpenStudy (anonymous):
Or you could use double angle formula for tan....
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