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