tanA+cotA=2 fins tanA-cotA
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tana+cota=2
Sq. in both sides
tan2a+cot2a+2=4
tan2a+cot2a=2
(tana-cota)2 +2=2
tana-cota=0
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When I sq the both side then is 2sq is 4 but you’re calculation show 2
no okay
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