1 + tan theta + sec theta×1+cot theta-cosec theta
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(1 + cos/sin - 1/sin ) (1+1/cos + sin /cos )
( cos + sin - 1) (cos + sin +1 )
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cos * sin
(cos+sin)² - 1²
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cos * sin
1+ 2 cos sin - 1
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cos * sin
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