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(C) does not reduce to sinx
sin2x.secx/tanx = sinx/cosx
sin2x.secx/tanx = sinx/cosx
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every where write secx=1/cosx and tanx=sin/cosx
1 and 2 will come as sinx
use sec^2x-tan^2x=1
3 one will also come to be sinx
so 4 option is correct
1 and 2 will come as sinx
use sec^2x-tan^2x=1
3 one will also come to be sinx
so 4 option is correct
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