Value of cosev(75-A)-sec(15-A)- tan(55-A)+ cot(35-A) is
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cosec(750+θ)−sec(150−θ)−tan(550+θ)+cot(350−θ)
=sec(900−750−θ)−sec(150−θ)−cot(900−550−θ)+cot(350−θ)
=sec(150−θ)−sec(150−θ)−cot(350+θ)+cot(350+θ)
=0
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