(sec A - cosec A) (1+tan A +cot A) = tan A sec A - cot A cosecA.
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(1/cosA-1/sinA)(1+sinA/cosA+cosA/sinA)
(sinA- cosA/cosA.sinA)(1+sin2A+cos2A/cosA.sinA)
(sinA-cosA/cosA.sinA)(1+1/cosA.sinA)
(sinA-cosA/cosA.sinA)(2/cosA.sinA)
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