plz.. solve this example
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since f(x)=tanx
therefore,
f(x+y)=tan(x+y)=(tanx+tany)/(1-tanx.tany)
and f(2x)=tan2x=2tanx/(1-tan²x)
therefore,
f(x+y)=tan(x+y)=(tanx+tany)/(1-tanx.tany)
and f(2x)=tan2x=2tanx/(1-tan²x)
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