cot A upon
1 - cot A
+tan A upon
1-tan A= -1
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Answer:
cotA/1-cotA+tanA/1-tanA
=cosA/sinA/sinA-cosA/sinA+sinA/cosA/cosA-sinA/cosA
=cosA/sinA-cosA+sinA/cosA-sinA
= -(sinA-cosA/sinA-cosA)
= -1
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