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OpenStudy (crashonce):
cot(40)-tan(40)=2tan(10) @ParthKohli easy proof sorry im dum
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Parth (parthkohli):
\[\cot A - \tan A = 2\cot(2A)\]You can use this identity. Or you can express 40 as a sum of 30 and 10.
OpenStudy (anonymous):
use formula tan(a+b)=tana+tanb/1-tanatanb
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