1+sin /cos + cos/1+sin = 2sec
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LHS = ( 1 + sin )2 + cos2 / cos ( 1 + sin)
= 1 + 2sin + sin2 + cos2 / cos ( 1 + sin )
= 2 + 2sin / cos ( 1+ sin )
= 2 / cos = 2sec
= 1 + 2sin + sin2 + cos2 / cos ( 1 + sin )
= 2 + 2sin / cos ( 1+ sin )
= 2 / cos = 2sec
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