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Simplify : ("sec"(270^@ - A) "sec"(90^...

Simplify :
`("sec"(270^@ - A) "sec"(90^@ - A) - tan (270^@ -A) tan (90^@ + A))/(cot A + tan (180^@ + A) + tan (90^@ + A) + tan (360^@ - A) + cos 180^@)`

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CHHAYA PUBLICATION-TRIGONOMETRIC RATIOS OF ASSOCIATED ANGLES-SAMPLE QUESTIONS FOR COMPETITIVE EXAMS - ASSERTION-REASON TYPE
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  3. Find the value of sin105^@

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