高二數(shù)學(xué)上冊必修四備考知識點(diǎn)-全文預(yù)覽
【正文】 } cot(A/2)=√{(1+cosA)/(1cosA)}? tan(A/2)=(1cosA)/sinA=sinA/(1+cosA) 和差化積 sin(a)+sin(b)=2sin[(a+b)/2]cos[(ab)/2] sin(a)sin(b)=2cos[(a+b)/2]sin[(ab)/2] cos(a)+cos(b)=2cos[(a+b)/2]cos[(ab)/2] cos(a)cos(b)=2sin[(a+b)/2]sin[(ab)/2] tanA+tanB=sin(A+B)/cosAcosB 積化和差 sin(a)sin(b)=1/2*[cos(a+b)cos(ab)] cos(a)cos(b)=1/2*[cos(a+b)+cos(ab)] sin(a)cos(b)=1/2*[sin(a+b)+sin(ab)] cos(a)sin(b)=1/2*[sin(a+b)sin(ab)] 誘導(dǎo)公式 sin(a)=sin(a) cos(a)=cos(a) sin(π/2a)=cos(a) cos(π/2a)=sin(a) sin(π/2+a)=cos(a) cos(π/2+a)=sin(a) sin(πa)=sin(a) cos(πa)=cos(a) sin(π+a)=sin(a) cos(π+a)=cos(a) tgA=tanA=sinA/cosA 萬能公式 sin(a)=[2tan(a/2)]/{1+[tan(a/2)]2} cos(a)={1[tan(a/2)]}/{1+[tan(a/2)]2} tan(a)=[2tan(a/2)]/{1[tan(a
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