cos(a-b)=cosacosb+sinasinb
所以原式=cos(82°-52°)=cos30°=√3/2
另外还有
cos(a+b)=cosacosb-sinasinb
sin(a+b)=sinacosb+cosasinb
sin(a-b)=sinacosb-cosasinb
tan(a+b)=(tana+tanb)/(1-tanatanb)
tan(a-b)=(tana-tanb)/(1+tanatanb)