tan x
tanx secx
sec2x
cosec2x
Correct answer is C
cos2x(sec2x+sec2xtan2x)
= cos2xsec2x+cos2xsec2xtan2x
= 1+tan2x
= 1+sin2xcos2x
= cos2x+sin2xcos2x
= 1cos2x=sec2x
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