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Answer 1 · 2017-03-31T01:42:39

#RHS= cosx - tanx/cscx#

#= cosx - (sinx/cosx)/(1/sinx)#

#= cosx - (sinx/cosx)xx(sinx/1)#

#= cosx - sin^2x/cosx#

#= (cos^2x - sin^2x)/cosx#

#= (cos^2x - 1+cos^2x)/cosx#

#= (2cos^2x - 1)/cosx#

#= (2cos^2x)/cos^2x - 1/cosx#

#= 2cosx - secx=LHS#

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