tan(65-θ)-cot(25-θ)-sec(55-θ)+cosec(35-θ)
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cosec(65+theta) -sec(25- theta) -tan(55-theta) +cot (35+theta)
=>sec[ 90-(65 +theta)] -sec(25-theta) -cot [90-(55-theta)] +cot (35+theta) since sec(90-x)=cosecx, cot(90-x) tanx
=> sec(25-theta) -sec(25-theta) -cot(35+theta)+cot(35+theta)
=>0 ans
=>sec[ 90-(65 +theta)] -sec(25-theta) -cot [90-(55-theta)] +cot (35+theta) since sec(90-x)=cosecx, cot(90-x) tanx
=> sec(25-theta) -sec(25-theta) -cot(35+theta)+cot(35+theta)
=>0 ans
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