若f(tanx)=sinxcosx,則f(2/3)的值是
若f(tanx)=sinxcosx,則f(2/3)的值是
數(shù)學(xué)人氣:212 ℃時間:2020-03-22 14:30:11
優(yōu)質(zhì)解答
原題:若f(tanx)=sinxcosx,則f(2/3)的值相當(dāng)于已知tanx=2/3,求sinxcosx則 sinxcosx =sinxcosx/(sin²x+cos²x) 分子分母同時除以cos²x=tanx/(tan²x+1)=(2/3)/[(4/9)+1]=(2/3)/(13/9)=6/13...
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