知函数f(x)=tan(2x+45°)化简

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知函数f(x)=tan(2x+45°)化简

f(x)=tan(2x+45°)
=(tan2x+tan45°)/(1-tan2x•tan45°)
=(tan2x+1)/(1-tan2x)
=2/(1-tan2x)-1
=2/[1-2tanx/(1-tan²x)]-1
=[2-(tanx-1)²]/[2-(tanx+1)²]

f(x)=tan(2x+45°)
=(tan2x+tan45°)/(1-tan2x•tan45°)
=(tan2x+1)/(1-tan2x)
=(tan2x-1+2)/(1-tan2x)
=2/(1-tan2x) -1