tanA-cotA=A,cotA-tanA=?
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1
TANA-COTA=A
-( COTA-TANA)=-(-A)
COTA-TANA =-A
-( COTA-TANA)=-(-A)
COTA-TANA =-A
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-(tanA-cotA)=cotA-tanA=-A
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