谁有关于诱导公式的练习题啊,五道选择,五个填空就可以

Question

谁有关于诱导公式的练习题啊,五道选择,五个填空就可以

Answer 1

1.sin115° =sin(90° +25° )=cos25° 2.cos95°=cos(90° +5° )=-sin5° 3.cosπ/5+cos2π/5+cos3π/5+cos4π/5=cosπ/5+cos2π/5+cos(π-2π/5)+cos(π-π/5)=cosπ/5+cos2π/5-cos2π/5-cosπ/5=04.tan10°+tan170°+sin1866°-sin（-606°）=tan10° +tan(180° -10° )+sin(5*360° +66° )+sin(540° +66° )=tan10° -tan10° +sin66° -sin66° =05.sin（-α-5π）×cos（α-π°/2）-tan（α-3π/2）×tan（2π-α）=-sin(5π+α)cos(π/2-α)+tan(3π/2-α)tan(-α)=-sin(π+α)sinα-cotαtanα=(sinα)^2-1=-(cosα)^2