2023精选中考理科数学公式
<p>精选中考理科数学公式</p><p>两角和与差的三角函数：sin(A+B) = sinAcosB+cosAsinB</p><p>sin(A-B) = sinAcosB-cosAsinB ?</p><p>cos(A+B) = cosAcosB-sinAsinB</p><p>cos(A-B) = cosAcosB+sinAsinB</p><p>tan(A+B) = (tanA+tanB)/(1-tanAtanB)</p><p>tan(A-B) = (tanA-tanB)/(1+tanAtanB)</p><p>cot(A+B) = (cotAcotB-1)/(cotB+cotA)</p><p>cot(A-B) = (cotAcotB+1)/(cotB-cotA)</p><p>三角和的三角函数：</p><p>sin(++)=sincoscos+cossincos+coscossin-sinsinsin</p><p>cos(++)=coscoscos-cossinsin-sincossin-sinsincos</p><p>tan(++)=(tan+tan+tan-tantantan)/(1-tantan-tantan-tantan)</p><p>辅助角公式：</p><p>Asin+Bcos=(A^2+B^2)^(1/2)sin(+t)，其中</p><p>sint=B/(A^2+B^2)^(1/2)</p><p>cost=A/(A^2+B^2)^(1/2)</p><p>tant=B/A</p><p>Asin+Bcos=(A^2+B^2)^(1/2)cos(-t)，tant=A/B</p><p>倍角公式：</p><p>sin(2)=2sincos=2/(tan+cot)</p><p>cos(2)=cos^2()-sin^2()=2cos^2()-1=1-2sin^2()</p><p>tan(2)=2tan/</p><p>三倍角公式：</p><p>sin(3)=3sin-4sin^3()</p><p>cos(3)=4cos^3()-3cos</p><p>半角公式：</p><p>sin(/2)=((1-cos)/2)</p><p>cos(/2)=((1+cos)/2)</p><p>tan(/2)=((1-cos)/(1+cos))=sin/(1+cos)=(1-cos)/sin</p>
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